通畅 tōngchàng unobstructed
unobstructed; clear; (of writing or thinking) coherent; fluent
How to remember 通畅: 通 pass through + 畅 freely = unobstructed.
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How it is used
- 'Unobstructed, flowing smoothly' - physically or in writing - 道路通畅 (dàolù tōngchàng) the road is clear; 呼吸通畅 (hūxī tōngchàng) breathe freely.
- Also for prose/logic: 文章通畅 the writing flows well. Antonym 堵塞 (dǔsè, blocked) - 交通堵塞 (jiāotōng dǔsè) a traffic jam.
- Compare 顺畅 (shùnchàng), a close synonym; 通畅 emphasizes 'nothing blocking the passage'.