The surprise discovery may help scientists solve the mystery of why humans shed tears when they're distressed or sad.
其结果是惊人的，而且这一结果也许还有助于解开人们为何伤心沮丧时就会落泪的谜题。
Strong, not face sad not shed a tear, but wiped tears to smile in the face of life in the future.
坚强，不是面对悲伤不流一滴泪，而是擦干眼泪后微笑着面对以后的生活。
Read this story, I am both happy and sad, eyes involuntarily shed tears of emotion.
读了这个故事，我既高兴又悲伤，眼眶不由自主地流下了激动的泪水。
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