About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an impressive fireball, and burns up before reaching the surface.
回顾一下常规的基本原理--至少一年一次的变化将会是新的记忆,并且可以适时的被注意到。
Review the schematic on a regular basis- say once a year at least- as changes will be fresh in the memory and can be duly noted.
我见到这个美国政府,或其代表,国家政府,直接面对面,一年一次-没有更多的人出来;
I meet this American government, or its representative, the State government, directly, and face to face, once a year- no more- in the person of its tax-gatherer;
海洋生物学家曾经认为它们孤独地生活在澳大利亚东部和新西兰北部的亚热带水域,相遇只为交配,一年一次。
Marine biologists once thought they inhabited the subtropical waters off eastern Australia and northern New Zealand in solitude, meeting only to mate, once a year.
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