Whenever we smile, nerves and muscles may transmit messages that turn on happiness centers in the brain, Laird speculates.
每当我们微笑时，神经和肌肉就会传递信息使大脑的快乐中心兴奋，莱尔德猜测说。
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。”
Friends are my happiness. Whenever I am sad and down, I know they would hold my hands and warm my heart. They show me how amazing the friendship is.
朋友是我的幸福。当我伤心或者低落的时候，我知道他们会握着我的手并温暖我的心。他们告诉我友谊有多么美好。
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