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視頻對話：
The edges are worn down from friction.
邊緣由于摩擦有所磨損。
Whatever tools they used to cause this leak weren't meant for the job.
不管他們用什么工具造成泄漏，都不是為了工作。
本期學習詞匯：
friction 
n.摩擦；沖突，不和；摩擦力
例句：
1. Matches are lighted by friction.
火柴由摩擦而生火。
2. The family never had friction.
這家人從來沒有摩擦。
3. Sara sensed that there had been friction between her children.
薩拉感覺到她的孩子之間有過爭執。
4. The plan is likely only to aggravate ethnic frictions.
這一方案很有可能只會加劇種族沖突。
5. The pistons are graphite-coated to reduce friction.
活塞上涂了一層石墨以減小摩擦力。
n. 摩擦，摩擦力，分歧
