Topics: 以 (yǐ) 大约 (dàyuē) 逐渐 (zhújiàn)
Level: Intermediate
Topics: 以 (yǐ) 往往 (wǎngwǎng) 才 (cái) 认为 (rènwéi)
Level: Upper Intermediate
Topics: 以 (yǐ) 常 (常) (cháng)
Topics: 以 (yǐ) 只好 (zhǐhǎo) 吗 (ma)
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