切洋葱为什么会流眼泪？

Cutting onions always makes you cry. 一切洋葱，你的眼睛就不争气。 The onion itself makes a sharp gas. 洋葱切开后，会放出一种冲人的气体。 The gas flies into your eyes. 这股气，直接飘进你的眼睛里。 Your eyes feel stinging and hurt. 眼睛一辣，就像被针扎了一下。 The body rushes to wash it away with tears. 身体赶紧调水来冲洗，那就是眼泪。 Cold water slows the gas down, people say. 把洋葱泡在水里切，气就跑慢了。 So you can cry less at dinner. 这样做饭时，眼泪就少流一点啦。