- water cycle
- 踏: step on; stamp on; tread
- 行船: sail a boat; navigate
- 行船: sail a boat; navigate 行船到最近的港口 navigate the ship to the nearest port; 逆風(fēng)行船 sail against the wind; 順風(fēng)行船 sail before the wind; 順流行船 navigate down the stream
- 最長(zhǎng)踏行時(shí)間: maximum walking time
- 最大踏行時(shí)間: maximal walking time
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