1 [U] ~ (on sth) power to produce an effect; action of natural forces 影响力; 作用 *the influence of the moon (on the tides), of the climate (on agricultural production), etc 月球（对潮汐）的作用、...
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action of natural forces
自然力的作用
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Erosion: wearing away of the land, usually by the action of natural forces.
UNESCO: L O S S A R Y
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