micro sign
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
The most common sign is a micro-facial expression - lasting one-fifth of a second.
最常见的就是仅仅持续五分之一秒的面部微表情。
youdao
The most common sign is a micro-facial expression – lasting 3 one-fifth of a second.
Robin Goad, a research director at Hitwise who has analysed Twitter growth, said businesses were definitely starting to sign up to the micro-blogging service.
BBC: Twitter followers 'can be bought'
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