学生志愿者贡献自己的时间来帮助交换生。
The student volunteers contributed their own time to helping exchanged students.
市场和街道上挤满了来进行物物交换的人。
The market-place and street were crowded with those who'd come to barter.
它们培养菌类,将蚜虫当作家畜来饲养,发对军队作战,使用化学喷雾来警告和迷惑敌人,捕获奴隶,雇佣童工,并且不停地交换信息。
They farm fungi, raise aphids as livestock, launch armies to war, use chemical sprays to alarm and confuse enemies, capture slaves, engage in child labour, exchange information ceaselessly.
I look at the rest of the list to decide what's the element to swap into the next place.
我会查看列表剩下的部分,来看看需要交换哪个元素。
Why don't I just keep track on each pass through the algorithm whether I have done any swaps?
我为什么不仅仅跟踪算法的,每一遍来看看我做了哪些交换呢?
So, these are all involved with our ability to maintain homeostasis by exchanging materials with the external environment.
这个过程关乎人体维持内稳态的能力,内稳态通过与外环境进行物质交换来实现
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