Whenever we smile, nerves and muscles may transmit messages that turn on happiness centers in the brain, Laird speculates. "The bottom line is that a smile doesn't cost anything and may do you good."
拉瑞德推测，无论何时我们微笑，神经和肌肉会传送打开大脑中快乐中心的信息，“结果是一个微笑不花费任何成本而可以使你感觉良好。”
Whenever he sees you, he always gives you a friendly smile which makes you comfortable.
无论你何时看见他，他总是给你一个友好的笑容，使你感到很舒服。
Whenever you make a phone call, smile when you speak.
无论何时你找电话请微笑著说话。
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