25a+b

substitute n.替代物  ~for 

Yogurt is a good substitute for sour cream because it is low in fat.

substitute teacher 代课教师

v. substitute A for B

Don't substitute vitamin for a healthy diet.

contain v. 包含

container 容器 n.  airtight containers 真空容器

concentrate 集中，浓缩v.  concentrated 浓缩的  ~ juice 浓缩果汁  ；全神贯注的  be ~ on

many of the country's population is concentrated in the coastal areas.

We finished the project with concetrated effort.

sth. brings us back to my point that 回到我要说的话(What was just said matches or supports a point that the speaker has mentioned earlier)

Everyone seems to think this project is worth doing. However, people are worried about sepnding too much money which brings us back to my point of needing to choose projects that are not too costly.

a good source of…

We need a good source of entertainment since there are so many TV shows are not good gor us to watch. 

call in sick 请病假?

hamburger  un. = ground beef 碎牛肉

                   cn.  = 牛肉汉堡

鸡排/鱼排汉堡  chicken/fish sandwich

27 a+b

perfect v.  = make sth. perfect

true colors  本色，真面目

The super star shows her true colors only in front of her close friends.

janitor 看门人，门房

The thief snuck into the building while the janitor was sleeping  (sneak into 潜行)

giggle 咯咯笑 v./n .   guffaw 狂笑

She burst into giggles after Sherry realized what happened

feel blue = have the blues = be sad about sth.

out of the blue  意外的

It rains out of blue~

in the black/red  公司盈/亏

be in the red = be in the debt

Your company is in the black, that's to say you are making money.

rub someone the wrong way让某人不舒服

I don't know what is about him, but he just rubs me the wrong way.

green with envy 嫉妒得很  be envy with

Susan is green with envy because Sindy was so popular

The damage is done 于事无补

Kobe tries to apologise to Freda for all of his mean words, but it's to late, the damage is done. 

mnemonic device 辅助记忆  比方你记月份大小的时候