他们把配对的雌性和雄性蝙蝠放入笼中，用以模仿自然环境，然后红外摄像头会把它们在夜间的勾交行为拍下传到实验室。
The researchers paired males and females in cages designed to mimic their natural environment, while infrared cameras beamed video of the creatures' nighttime liaisons back to the lab.
小红点和其配对按键之间的空间配置也相当适当，这让我们在用拇指点击的时候感觉很自然。
The pointing stick is also well-spaced from the matching buttons, which meant clicking with the thumb of that hand felt natural.
可以把这种对应看作是各负责另一人之安全的两人同行制，每一个自然数都与某个正分数配对，反之亦然。
You could think of this correspondence as a buddy system in which each natural number is paired with some positive fraction, and vice versa.
共有四十学生参加，他们是配对抽样从两自然班选出并被分成四组，每组十人。
Forty students, selected from two natural classes by pair-sampling, were assigned to four groups, ten subjects for each group.
共有四十学生参加，他们是配对抽样从两自然班选出并被分成四组，每组十人。
Forty students, selected from two natural classes by pair-sampling, were assigned to four groups, ten subjects for each group.
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