1. The event took an explosive turn.
   事态起了急剧变化。
2. Matters have taken a bad turn.
   事情恶化。
3. At summer picnics,there is often an informal baseball game.Boys and girls,the young and the old,take turns to bate.Each team has 9 plyers.
   夏日夜餐时，经常有非正式的棒球比赛。男孩女孩，年轻的年老的，都会轮流比赛。每个队有9个球员。
4. After laying down my pen, I took several turns in a berceau, or covered walk of acacias, which commands a prospect of the country, the lake, and the mountains.
   我放下了笔，在金合欢树荫盖的步道上走了几个来回。从那里可以看见田野、湖水和远山。

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