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																										- 潮汐是月亮引力作用的结果。
 The tides depend on the pull of the moon.
- 依照上面所说的,我们知道潮汐可以是非常有帮助的。
 As we learn from what is said above, the tides can be very useful.
- 月球对地球的吸引力造成潮汐。
 The attraction of the moon for the earth causes the tides.
 
 
 
 
 
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