关于人类为什么哭的时候会流泪，科学家已经提出了很多理论。
Scientists have advanced many theories about why human beings cry tears.
“他站起来了并且很快乐…只是十分情绪化，哭的很多”—克劳斯·沃尔曼，2000。
"He was up and happy... but very emotional, crying a lot." Klaus Voormann, 2000.
每个人都被震呆了，很多人在哭，没有人知道真的发生了什么。
Everyone was in shock. Some people were crying and no one really knew what was happening.
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