一只大的黑色的蝙蝠飞过去了。
研究小组模拟了黑暗，昏暗，明亮三种不同的光照条件，以此来观察蝙蝠飞过场地的情况。
The team manipulated three types of light conditions-dark, dim, and bright-and observed how little brown bats flying through the course behaved.
有一个夜晚，蝙蝠飞过来，抓住鸟笼的栅栏，问她为什么白天默默无声，却在夜里放声歌唱。
One night a bat came and clung to the bars of the cage, and asked the bird why she was silent by day and sang only at night.
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