half revolution

基本解释

The attraction of these magnets caused the wheel to rotate one half revolution.
吸引这些磁铁造成车轮转动的二分之一革命。
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He learned that he could reverse the wiring to one magnet, and get the wheel to complete another half revolution, for one complete revolution.
他得知他可能扭转配线一个磁铁，让车轮来完成另一半的革命，对于一个完整革命。
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Once the correct track is found, the read-write head must wait for the data to rotate into position. On the average, this takes half a revolution.
当读写头到达正确的位置后开始读（或写）过程，驱动器可以很快地把大量的数据转移到主存中。
blog.sina.com.cn

"It never will be." Hen-Tov says Iranian leaders are perplexed - even envious - that a country that was half as rich as Iran was years 30 ago, when the Islamic Revolution took place, is today twice as wealthy as Iran.
Suppose that as a kind of back-up security whenever revolution has done is-- produced so much redundancy in the brain that either half of the brain was sufficed.
假设我们有理论支撑,未来的进化-,会使大脑产生很多多余的部分,我们只需要一半大脑就足够了。
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