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2715 at no time从不,决不【
2714 at one time曾经,一度【
2713 at a time每次,一次【
2712 have a hard time(in)doing sth做……很困难【
2711 many a time多次【
2710 on time按时【
2709 in time及时【
2708 from time to time有时,不时【
2707 at the same time同时【
2706 all the time一直,始终【
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