这座喷泉创造了一种永恒流动的错觉。
The fountain creates an illusion of ___perpetual flow.
她购买了一种永续债券，可以终身获得固定收益。
She bought a ___perpetual bond that pays fixed income for life.
他对工作没完没了的抱怨让同事们感到疲惫。
His ___perpetual complaints about work tired out his colleagues.
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