in case万一。是连词，引导条件状语从句。也就是说in case后面是一个完整的句子 Take a hat with you in case the sun is very hot. 倘若太阳很利害，你就把帽子戴上。 in case of的of是介词，介词后面只能带名词性质的词，比如名词、代词等。意思和in case差不多，万一的意思 In case of rain they can't go. 万一下雨，他们就不能去了。 in the case of，就...来说, 关于。意思跟上面两个不一样了。一般表示转而提及另一件事情。比如 In the case of woman，they have more difficulty in their job。就女性来说，她们在工作中会遇到更多的困难

1. We have an auxiliary generator in case of power cuts.
我们有一台万一断电时使用的备用发电机。
2. In case you need something, please don't hesitate to let me know.
如果你需要什么东西，请不客气地对我说。
3. It may rain you'd better take an umbrella (just) in case (it does).
可能下雨--你最好带把伞, 以防万一（下起来）.
4. In case that he leaves, please inform me.
如果他离开, 请通知我。
5. In case of rain, they can't go.
万一下雨，他们就不能去了。
6. In case (=If) I forget, please remind me.
万一我忘记，请提醒我。
7. Write the telephone number down in case you forget.
把电话号码写下来以免忘了。
8. The doctor asked us to call him during the night except in case of necessity.
医生吩咐我们，除非必须，否则不要在夜里叫他。

case
case 1
AHD:[k³s]
D.J.[keis]
K.K.[kes]
n.（名词）
An instance of something; an occurrence; an example:
事例：事例；事件；例子：
a case of mistaken identity.See Synonyms at example
一个身份有误的例子参见 example
An occurrence of a disease or disorder:
病例：一种疾病或不适的例子：
a mild case of flu.
轻度流感的病例
A set of circumstances or a state of affairs; a situation:
情况，状况：一系列情况或事件的一种状态；状况：
It may rain, in which case the hike will be canceled.
天或许会下雨，如果是那样的话，徒步旅行将会被取消
Actual fact; reality:
事实：实际情况；现实：
We suspected the walls were hollow, and this proved to be the case.
我们怀疑墙是空的，这证明是事实
A question or problem; a matter:
问题；事情：
It is simply a case of honor.
这纯粹是一个荣誉的问题
A situation that requires investigation, especially by a formal or official body.
需调查的情况：一种需要调查，尤其是需要一个正式或官方机构调查的情况
Law
【法律】
An action or a suit or just grounds for an action.
诉讼，讼案：诉讼或诉讼的正当理由
The facts or evidence offered in support of a claim.
证据：所提供的支持一项诉讼的事实或者证据
A set of reasons or supporting facts; an argument:
理由，论据：一系列理由或支持性的事实；论据：
presented a good case for changing the law.
提出了一条很好的变更法律的理由
A person or group of persons being assisted, treated, or studied, as by a physician, lawyer, or social worker.
病人，委托人：被医生、律师或社会工作者援助、治疗或研究的一个人或一群人
Informal A peculiar or eccentric person; a character.
【非正式用语】 怪人：一个奇特或怪癖的人；怪人
Linguistics
【语言学】
The syntactic relationship of a noun, a pronoun or a determiner to the other words of a sentence, indicated by declensional endings, by the position of the words within the sentence, by prepositions, or by postpositions.
格：一个名词、代词或一个限定词与一个句子中其它词的句法关系，通过词尾变化、这些词在句子中的位置、介词或者后置词表示出来
The form or position of a word that indicates this relationship.
格的字形或位置：表示这一关系的一个词的形式或者位置
Such forms, positions, and relationships considered as a group.
一组格的字形或位置：被认为是一组的这样的形式、位置和关系
A pattern of inflection of nouns, pronouns, and adjectives to express different syntactic functions in a sentence.
词形变化形式：名词、代词和形容词在一个句子中表示不同的句法功能的词形屈折变化的形式
The form of such an inflected word.
变形词：这样一个词形发生屈折变化的词的形式
v.tr.（及物动词）
cased， cas.ing， cas.es【非正式用语】
To examine carefully, as in planning a crime:
踩点：仔细检查，如策划一项犯罪时：
cased the bank before robbing it.
在抢劫银行前对其踩点

in any case
Regardless of what has occurred or will occur.
无论如何，总之：不管已经或将要发生什么
in case
If it happens that; if.
如果发生；如果
As a precaution:
以防万一：
took along an umbrella, just in case.
随身带一把伞，以防万一
in case of
If there should happen to be:
如果发生：
a number to call in case of emergency.
万一发生意外打的号码

Middle English cas
中古英语 cas
from Old French
源自 古法语
from Latin c³s [from past participle of] cadere [to fall] * see kad-
源自 拉丁语 c³s [] 源自cadere的过去分词 [坠落] *参见 kad-

case
case 2
AHD:[k³s]
D.J.[keis]
K.K.[kes]
n.（名词）
A container; a receptacle:
容器：
a jewelry case; meat-filled cases of dough.
珠宝盒；塞肉的面团
Abbr. c., C., cs.A container with its contents.
缩写 c.， C.， cs.一盒之物：一个容器与其所盛的东西
A decorative or protective covering or cover.
罩子：一个装饰性或保护性的罩或盖
A set or pair:
一组；一对：
a case of pistols.
一对手枪
The frame or framework of a window, door, or stairway.
框子：窗、门或楼梯的框子或架子
The surface or outer layer of a metal alloy.
外层：金属合金的表面或外层
v.tr.（及物动词）
cased， cas.ing， cas.es
To put into or cover with a case; encase.
把…装箱：放进一个容器或盖上一个盖；把…装进箱子

Middle English
中古英语
from Norman French casse
源自 诺曼法语 casse
from Latin capsa
源自 拉丁语 capsa

case 1
[keIs]
n.
事；事例
a case of stupidity
愚笨的事
This is a case of stupidity, not dishonesty.
这只是个愚蠢的例子,并非不诚实。
情形；场合；状况
'Well, in that case, I would prefer to stay on the bus,' I answered.
`唉,那样的话,我宁愿留在车上啦,'我回答说。
a case of poverty
穷苦的情形
病症；病例
This is a case of fever.
这是一发烧的病例。
病人；患者
There are three cases of fever in school.
学校有三个发烧病人了。
案件；诉讼
a difficult case to prove
一个很难办的案子
In this case I'm acting for my friend Mr Smith.
我在这次诉讼中代表我的朋友史密斯的利益。
The case against Mr. White is said to be heard tomorrow.
据说怀特先生被起诉一案定于明天开庭。
The case was settled out of court.
这案件在庭外解决。
（受警方及社会监管的）个案
判例；讼案
事实；实情
The police have a clear case against the prisoner.
警察有充足的事实对付那个囚犯。
Is that the case? No, that's not the case.
事实是那样吗?不,事实并非如此。
〈语法〉格
the nominative case
主格

in case
以防；可能；倘若
Take a hat with you in case the sun is very hot.
倘若太阳很利害，你就把帽子戴上。
in case of
如果；万一
In case of rain they can't go.
万一下雨，他们就不能去了。

case 2
[keIs]
n.
箱；盒；容器
He took a case full of clothes with him.
他把一个装满衣服的箱子带在身边。
框子；架子
套子；壳子
the case of a watch
表壳

case
vt.
装箱，装盒
The goods have been cased up for transport.
货物已装箱待运。
（与with连用）包装
（行窃前）查勘，踩道儿

in case 是万一的意思
In case of raining,we'd better take an umbrealla.就这样用。