The Expression problem is a real, practical problem in object-oriented programming, and most common solutions to it are inadequate.

表达式问题在面向对象的编程中是真实的、实际的问题，且针对它的最通用的解决方案是不足的。

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A study published in the journal PLoS ONE suggests that hypnosis is real, and can be identified by a glazed expression.

《公共科学图书馆》刊发了一项研究，认为催眠是真实存在的，能从呆滞的表情识别出。

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A video camera connected to facial recognition software gave the robot feedback: When it made a movement that resembled a "real" expression, it received a reward signal.

一台与面部表情识别软件相连的摄影机给机器人反馈信号：当机器人做出一个类似于“现实的”表情时，摄影机就会收到动作信号。

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In the limited fashion of the corporate world, cufflinks are the ultimate mood gaugers and prime real estate for sartorial self-expression.

WSJ: Off the Cuff Remarkable

But more recently, a real trend is emerging toward the use of data as a form of self expression.

FORBES: Your Data Is the New Black

They were serving themselves, using the tongs, learning manners, having conversation -- not with real sentences or anything -- (laughter) -- but all the expression that goes along with sitting at the table and having a glass of milk and passing the food.

WHITEHOUSE: First Lady Michelle Obama Unveils Lets Move! Child Care