Some changes happen only once in a while, like an eclipse of the moon. Others happen repeatedly, like the rising and setting of the sun.
某些变化只是偶尔发生一次，就像月食一样，其他变化则重复发生，如同日升日落一般。
Some changes happen only once in a while, like an eclipse of the moon.
一些变化只有某个时候才会发生，比如月食。
In the real world, changes never stop. Some changes happen only once in a while, like an eclipse of the moon.
在现实世界里，变化是永无止境的，有一些变化，如月食，只发生在瞬间，而另一些变化则反复出现，比如日出和日落。
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