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为什么海豹在岸上总是“泪流满面”?
看起来这是一头“泪流满面”的幼年象海豹……眼睛都“哭”红了。它为什么会流泪呢?因为难过吗?人类和陆生哺乳动物的眼泪由泪腺分泌,流过眼球表面后,会通过内眼角的一个管道流入鼻腔。这个管道叫做鼻泪管。鼻泪管(Nasolacrimal ...
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