我们给出的答案当然是它们的行为大部分是自然选择的结果。
The answer we'll propose of course is that their behavior is largely a matter of natural selection.
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.
在此，我们将会看看自然独占的行为以及应付它们的管制选择。
Here, we will look at the behavior of natural monopolies and regulatory options for dealing with them.
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