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.
科学家提出了许多关于人类为什么哭的理论，但没有一个得到证实。
Scientists have advanced many theories about why human beings cry tears, none of which has been proved.
哈薛说，我主为什么哭。
奶奶困惑地问：“为什么哭啊？”
“你为什么哭呢？”另一个孩子说。
安德斯·托马斯。你为什么哭。
参观者：你为什么哭？
“你为什么哭呢？你知道，我是多么爱你呀！”渔夫说。
Why your eyes are full of tears? You know, I love you deeply. "The fishermen says".
我不知道他们为什么哭，但我知道那眼泪来自他们的内心！
I don't know why they are crying. But I know the tear is from their hearts.
今日科学时刻叶将向大家解释为什么哭的时候眼睛会浮肿。
In this Moment of Science yael explains to Don why our eyes get puffy when we cry.
对于初为父母的人来说，有时候很难弄清楚到底孩子为什么哭。
Sometimes, for a new parent, it can be very difficult to work exactly what your baby is crying about.
嗯，我认为你的裙子真漂亮。告诉我，小姑娘，你为什么哭呢？
Well, I think it's very pretty, so tell me little one, why are you crying?
他看到小女儿正在哭泣，于是比划着问她为什么哭，女儿的手指向了她妈妈的车。
He signaled to her, asking about the reason for her tears. She pointed to her mother's car.
“他为什么哭呢？”一条绿色的小蜥蜴高高地翘起尾巴从他身旁跑过时，这样问道。
"Why is he weeping?" asked a little Green Lizard, as he ran past him with his tail in the air.
她把头埋在手臂里不断地哭，一直到都忘了自己为什么哭了，才合上眼睑在美丽的夜空下渐渐睡去。
She buried her head in her arms and cried and cried, till she forgot what she was crying about, and just rested in the beautiful darkness behind her eyelids.
妈妈告诉安娜2018年还会有世界杯的，这可对她源源不绝的眼泪毫无作用。显然，妈妈并不懂宝贝为什么哭。
The suggestion that there will be another World Cup in 2018 does nothing to stem the water works. Clearly, mom just doesn't get it.
鲍勃很吃惊，问她怎么了，为什么哭。她说，“今天真是我一生中最糟糕的一天，首先，小比利从自行车上摔了下来，扭了脚脖子；
Bob was confused and asked why she was crying. She said, "This is the worst day of my life. First, little Billy fell off his bike and twisted his ankle."
为什么父母会对他们的孩子说“没什么好哭的”？
Why do parents say "It's nothing to cry about" to their children?
你怎么会为一个你几乎不认识的人哭泣，我为什么要哭，是为s还是为她的故事而哭？
How do you cry for someone you hardly know? And for what was I crying? S or her story?
我穿着牛仔裤、衬衫，扎着马尾辫坐在那里，突然有想哭的冲动。为什么有人竟如此完美？
Sitting there in my jeans, shirt and hair in a pony tail, I wanted to cry. How could some people have it all?
对啊。那就是为什么女孩子看了都在哭。
对啊。那就是为什么女孩子看了都在哭。
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