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| 11. | alternate with sth/alternate between A and B :occur in turn;consist of two different things in turn |
| 轮流;交替 |
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| 12. | Sea urchins, which feed mainly on algae, live in environments that alternate between species-rich kelp |
| 海胆，主要以藻类为食，它决定着环境是成为品种丰富的海藻森林还是海胆遍地的“荒原”。 |
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| 13. | A previously healthy24 year old student begins exhibiting mood swings that alternate between great sadness |
| 原来很健康的24岁学生开始表现出异常悲伤和异常愤怒之间轮替的情绪波动。 |
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| 14. | Many of the common materials of the earth's crust may alternate between the living and the nonliving |
| 地球表面上有许多普通的状之都可能在有生命和无生命中交替。 |
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| 15. | At higher latitudes, the winds are much slower and tend to alternate between blowing to the west and |
| 在更高的纬度上，风速大减，且有风向朝西与朝东交替变化的趋势。 |
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| 16. | This voltage will be negative if the line is idle and alternate between that negative level and a positive |
| 译为：“该引脚的电平，如果在总线空闲状态，其电压为负，而在数据发送状态，其电平则在±5～±15伏的正电平和负电平之间变化。”？ |
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