这些老鼠分成两组，一半在室温下暴露于这种气体，另一半则在更温暖的环境下以便保持他们的体温不下降。

The mice were split into two groups. Half were exposed to the gas at room temperature and half in a warm environment to keep their body temperatures from dropping.

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堆芯的一半都暴露在水面上，主回路中水的辐射水平达到正常标准的350倍。

Half of the core is now uncovered, and the radioactivity of the water in the primary loop is 350 times its normal level.

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研究人员对老鼠进行了超过七周的实验，其中一半的老鼠一周六天每天暴露在4支卷烟的烟雾中，而另一半则完全处在无烟环境中。

Mice were studied over seven weeks, with half exposed to smoke from four cigarettes a day for six days a week while the other half smoke free.

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