一种有礼貌的说法
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... put sth away 收捡好某物 a polite expression一个有礼貌的表达 weigh sth in one’s hand用手掂量 ...
a polite expression
礼貌的表达
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By contrast, a standard social smile, which is sometimes called a Pan Am smile after the polite expression the former airline's stewardesses used to greet passengers, activates only the muscles around the mouth.
WSJ: Stress-Busting Smiles
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