不定期船费率随航运市场的供求关系而波动。在市场繁荣时期，不定期船费率上升，在市场萧条时期，费率下降。
Tramp rates fluctuate with market conditions of supply and demand. In a boom period, the tramp rates rise; in a period of recession, they decline.
航运市场分为两类：班轮运输和不定期船运输。
There are two types of shipping markets: the linker market and the tramp market.
航运市场分为两类：班轮运输和不定期船运输。
There are two types of shipping markets: the linker market and the tramp market.
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