res is the usual result of an I/O operation: the number of bytes transfered, or a negative error code.

res是IO操作的通常结果：传输的字节数，或者负值的错误码。

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Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.

一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。

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In recent years "managed the city" the operation pattern to obtain the certain result while our country, also appeared some deviations or the negative effect.

近年来“经营城市”运作模式在我国取得一定成效的同时，也出现了一些偏差或负面效应。

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U.S. armed forces in Afghanistan and Iraq learned that the positive or negative impacts of an operation on the local population are an important metric of mission effectiveness.

CNN: Bring drones out of the shadows