For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
the International Union for the Conservation of Nature has classified all tigers as endangered, which prohibits their movement in commercial international trade。
自然保护国际联盟将老虎定为濒于灭绝的物种，因此贩卖老虎的活动是禁止的。
At that time, a vigorous environmental movement got going in the west. Later it developed into an urban conservation movement and became an important part of western social activism.
那时候西方就开始出现轰轰烈烈的民众环保运动，逐渐推广到老城的保护运动，成为西方社会运动的重要组成部分。
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