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    4)Tramp service 不定期船運輸
    英文原文：Tramp service has no fixed itinerary or schedule and is operated on any route according to supply and demand. Tramp vessels are usually chartered at negotiated rates, particularly when the quantity of cargo is large.
    注釋：according to ：根據(jù)，按照 charter: 租賃，包租
    中文意思：不定期船運輸沒有固定的路線或者船期表，根據(jù)供求情況在任何線路上營運。通常是在談判價格下租賃不定期船船舶，特別是當(dāng)貨物的數(shù)量很大的時候。