In fact, smiling can boost your mood and even your immune system.
事实上，笑可以振作精神，增强免疫系统。
She came into my life and I felt that even the whole world was smiling.
她进入我的生活，我感到整个世界都在微笑。
Of course, once you start smiling, people start smiling back and you feel even better.
当然还有，一旦你对别人微笑，别人也回报你一个微笑，你的愉快好像加了倍。
Keep smiling and never give up, even when things get you down.
保持微笑。什么都不能将你击倒。
Whether in school or outside, even strangers, Americans will be smiling, friendly and say hello.
无论是在校园还是校外，即使互不相识，美国人都会面带微笑，热情的跟我打招呼。
Whether in school or outside, even strangers, Americans will be smiling, friendly and say hello.
无论是在校园还是校外，即使互不相识，美国人都会面带微笑，热情的跟我打招呼。
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