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重点讲解：
1.weave in and out 进进出出
例句：Cyclists weave in and out of the traffic.
骑自行车的人在车辆中间穿来穿去。
2.drift into 不知不觉陷入
例句：We drift into certain decisions because other people approve of them.
我们恍惚地做出某些决定，因为别人认可它们。
3.begin a relationship 开始恋爱
例句：How long after you met did you and your partner begin a relationship?
你们认识之后多久开始恋爱关系？
4.shift back and forth 来回转变
例句：Land use will no doubt continue to shift back and forth between agriculture and forestry as well as other uses in the free market.
土地利用无疑将继续在农业、林业以及自由市场上的其它用途间来回变动。
