Movement down a concentration gradient occurs fairly rapidly over short distances like a micron or so, like the size of a bacterium.

顺浓度梯度扩散在一微米左右的短距离内,相当迅速,一微米相当于一个细菌的大小

耶鲁公开课 - 生物医学工程探索课程节选

Immigration rights activists said the size of their movement would be on display at rallies around the country, including in the nation's capital, where National Association for the Advancement of Colored People President Benjamin Jealous will deliver the keynote address.

NPR: Thousands Rally Across US For Immigration Bill

One of the dangers of the "good governance" movement is the notion that one size fits all, which is held by many, including some major institutional shareholders and the proxy rating agencies, at least on many issues.

WSJ: The Experts: Are 'Superstar' CEOs Paid Too Much?

Together with his Siberian Mouse and Egyptian Lizard, the fancifully-named insect was a life-size automaton with perfectly realistic movement.

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