HSK 6
畅通
chàngtōng形
unobstructed; unimpeded; free-flowing; smooth
交警及时让道路恢复畅通。
Jiāo jǐng jí shí ràng dào lù huī fù chàng tōng.
The traffic police promptly restored the smooth flow of traffic.
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New in the HSK 3.0 word list at level 6.