She bit the tip of her left thumb, not looking at me.

她咬着左手的大拇指头，也不看我。

《柯林斯英汉双解大词典》

A good rule of thumb is to encrypt on a 32-bit CPU at the rate of 10 CPU clock cycles per byte.

一个好的经验法则是在32位CPU上以每字节10个CPU时钟周期的速率加密。

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