The cycle of quitting the addictive behavior, going through withdrawal, and relapsing may become self-reinforcing.
对成瘾行为的戒除要经过戒除和复发的循环，最终形成自我强化机制。
The global average withdrawal of fresh water was 9% of the amount that flowed through the world's hydrologic cycle. Both Latin America and Africa used less than 6% (see table).
全球平均能汲取降水量的用水，只占全球的水循环水量的9%，至于拉丁美洲和非洲能用到的水量，更低于6%(见下表)。
The global average withdrawal of fresh water was 9% of the amount that flowed through the world’s hydrologic cycle.
世界水循环中，每年平均只有9%的淡水流失。
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