Our findings indicate that both opsin genes have been under purifying selection in the majority bats despite a long history of nocturnality.
但对恒频言，视觉退化根本原在于它具有一种更发声定位能力。
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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.
随着回声定位能力的增强，进行更远距离跳跃的能力也随之增强，变成滑翔和动力飞行。
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划词翻译
详细解释
言，视觉退化
根本原
在于它具有一种更发
声定位能力。
-动物趣闻
变成滑翔和动力飞行。
