（夏儂在上哲學課的時候跟不上進度。）
例: Kent couldn't keep up with Tim during the race, so he quit halfway through.
（肯特在賽跑中因為跟不上提姆的速度而中途棄賽。）

8. lose...to...　　流失……到………
例: The bookstore is losing all of its customers to the big discount chain down the road.
（那家書店的客源正在流失，顧客都轉到街上那家大型折扣連鎖書店去了。）

9. mandatory a. 義務的；強制的
例: It is mandatory for all citizens in that country to serve in the military for two years.
（該國所有公民都要服兩年的兵役。）

10. insufficient a. 不足的
sufficient a. 足夠的
例: Al had insufficient funds on his credit card to pay for the diamond ring.

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