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1. 天文学家可以算出何时发生日食和月食。

   tiān​wén​xué​jiā kě​yǐ suàn chū hé​shí fā​shēng rì​shí hé yuè​shí.

   Astronomers can calculate when there will be eclipses of the sun and moon.

   Source: UM-Corpus: Education