invitation
n. 邀請(qǐng)，請(qǐng)?zhí)?

occasion
n. 場(chǎng)合，時(shí)刻

permission
n. 允許，答應(yīng)，同意，許可

politeness
n. 禮貌，斯文，文雅

specify
v. 指定，具體說(shuō)明，詳細(xì)說(shuō)明

technician
n. 技術(shù)員，技術(shù)人員

have... over
請(qǐng)…過(guò)來(lái)

change one's mind
改變主意

be particular about
特別講究…

no later than
不遲于

show... around
領(lǐng)…到處參觀

for the sake of
為了

Merry Learning

A Joke

The lecturer had been talking on evolution（進(jìn)化） for two hours. Then he asked: "If we had tails like a monkey, where are they?"
An old lady thought for a while and then said: "We have worn them off sitting here so long."

Phonetics

y和y的字母組合在單詞詞尾的讀音：
why fly July reply supply
many carry quality
pay play display
boy

Pronunciation and Intonation

A: I give up! I simply can't learn French!
B: Why do you say that? I think you're making a lot of progress.
A: No, I'm not. I try and try and I still can't speak it very well.
B: Learning any language takes a lot of effort. But don't give up.