慢速英语:词汇节目:千载难逢

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lunar – adj. of or relating to the moon

phenomenon – n. something (such as an interesting fact or event) that can be observed and studied and that typically is unusual or difficult to understand or explain fully

infrequent – adj. not happening often : not frequent

rare – adj. very uncommon

seldom – adj. not often : almost never

eternity – n. time that seems to be without an end