Our findings indicate that both opsin genes have been under purifying selection in the majority bats despite a long history of nocturnality.
但蝙蝠而言，视觉退化的根本原在于它具有一种更发达的回能力。
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As its ability to echolocate evolved in power, so too did its ability to make longer jumps, which eventually turned into gliding and powered flight.
随着回声定的增强，进行更跳跃的也随之增强，最终演变成滑翔和动飞行。
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详细解释
蝙蝠而言，视觉退化的根本原
在于它具有一种更发达的回
能力。
跳跃的
