国际集装箱班轮运输航线规划策略，从本质意义上说是一种条件极值问题。
The international container service layout strategy is essentially a kind of conditional extremum issue.
班轮运输有三个专门要素：固定的港口，固定的航线和预定的船期表。
Liner transport has three specific components: fixed ports, fixed routes and announcing shipping time in advice.
接下来阐述了班轮航线的结构类型，对运输航线设置特点及遵循原则进行阐述，而且对大船配大线原则也做了详细证明。
Traits of shipping lines setting and principles to follow are also analyzed, as well as the principle of arranging larger ship by longer course.
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