试试 HanyuGuide 的主动间隔重复系统。
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science and technology is the number one productive force (from a 1978 speech by Deng Xiaoping 鄧小平|邓小平[dèng xiǎo píng] introducing the Four Modernizations 四個現代化|四个现代化[sì ge xiàn dài huà])
power
to be born
to produce; to manufacture
to give birth
