arithmetic
n.算术；计算
We learn arithmetic right after we enter kindergarten.
我们进幼稚园后就开始学算术了。
When it comes to doing arithmetic, Mark is a genius.
说到做算术，马克是天才。
postpone
vt.延期，延缓
Because of the approaching typhoon, we decided to postpone holding the meeting until next Friday.
由于台风逼近，我们决定将会议延至下周五再举行。
postponement
n.延期，延缓
The client seemed unsatisfied with the postponement of the delivery.
该顾客似乎对于送货时间延期很不满意。
emperor
n.皇帝
China has already seen its last emperor.
中国最后一位皇帝已成历史。
disappoint
vt.使失望
My son disappointed me when he failed the test. =My son let me down when he failed the test.
我儿子考试没及格，令我失望。
disappointed
a.感到失望的
I'm disappointed in you because you didn't tell me the truth.
我对你很失望，因为你没讲实话。
John was disappointed with his son's behavior at the party.
约翰对儿子在派对上的表现感到失望。
disappointing
a.令人失望的；扫兴的
That was a somewhat disappointing result for me.
那样的结果使我有些失望。
The weather this fall has been disappointing.
今年秋天的天气一直很扫兴。
disappointment
n.失望；失望之情
To our disappointment, it rained on the day of the field trip.
令我们失望的是，校外教学那天下雨了。
Ned couldn't hide his disappointment when Jane refused his proposal.
当阿珍拒绝他的求婚时，奈德难掩失望之情。
feather
n.羽毛
Birds of a feather flock together.
物以类聚。一-谚语
fur
n.(动物的）皮毛
Conservationists discourage people from wearing fur coats.
保育人士劝阻大家不要穿皮草大衣。