So keep it simple: "hi", "Hey" or "Hello"—do the best you can to gather all of the enthusiasm and energy you can, put on a big smile and say "Hi".

所以简单点说：“嗨”、“嘿”或“你好”——尽你所能调动你所有的热情和能量，露出一个大大的笑容并说“嗨”。

youdao

Keep it simple: "Hi", "Hey" or "Hello"—do the best you can to gather all of the enthusiasm and energy you can, put on a big smile and say "Hi".

保持简单地说：“嗨、喂或你好”——尽你所能地集中所有的热情和精力，笑容满面地说“嗨”。

youdao

Sometimes we share a friendly smile or say hello, but lots of people don't even know their neighbor's names! When you don't know someone, it's easy to be angry when something has happened that you think is unfair.

有时我们会给彼此一个友好的微笑或打招呼，但很多人甚至不知道他们的邻居的名字！当你不认识某人时，在你认为不公平的事情发生时生气。

youdao

Within 20 degrees of separation from you initial smile to the three people, the entire world will be smiling.

只需要20度的分隔,从你用笑容感染三个人开始，全世界就会笑起来。

哈佛公开课 - 幸福课课程节选

My prayer for you is that, 10 years later, when you think of them -- 10 years later when you think of them that it brings a smile to your lips before it brings a tear to your eye.

WHITEHOUSE: Vice President Biden gives Remarks at the Pentagon

"To think that smile of hers, that you were the last to see it, " Stigell said directly to Alcala, who was present in court for the sentencing Monday.

CNN: STORY HIGHLIGHTS

Try not to smile when you think of a freshly-shoveled walk, or when the roses seem to multiply overnight.

FORBES: How Would I Behave If I Were Happy