试试 HanyuGuide 的主动间隔重复系统。
音频遵循 Creative Commons Attribution-ShareAlike 4.0 International License , 并基于 CC-CEDICT 的工作。
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letter
to count
number
frequently
numeral
to set up; to put in place
facilities
to transmit
(visitor, tour, audio etc) guide
(bound form) to put into effect (regulations etc)
to look at