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循環,(一)週期[U][C]
The annual revolution of the earth round the sun causes the revolution of the seasons.
地球每年繞太陽公轉而形成四季循環。
(天體的)運行,公轉[C][U][(+round)]
One revolution of the earth around the sun takes a year.
地球繞太陽運行一周需一年時間。
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