背1遍就想上考場四級單詞 Week 5 Day 6_420-421-例句?

[ti:] [ar:] [al:] [by:聽力課堂網(wǎng)～m.42bites.com] [00:00]pump [00:02]The ship’s generator broke down, [00:04]and the pumps had to be operated manaually [00:07] instead of mechanically. [00:10]geometry [00:12]The former helicopter pilot is using his spare [00:15]time to teach himself calculus and advanced [00:19]geometry.

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