航路设计图给出主要港口之间的航线和航程以及一年中每个月预计的气象和海洋状况。

The charts include routes and distance between major ports with expected meteorological and oceanographic conditions for each month of the year.

youdao

现阶段有关潜艇的航路规划算法研究得较少，且现有的潜艇航路规划算法一般都没有考虑海洋环境因素的影响。

But the submarine route planning algorithms are seldom studied currently furthermore, existing algorithms have not taken the ocean environment factors into consideration.

youdao

And that was only possible because, besides using the sea, the shipping lanes for travel, which was much faster than overland travel, the Romans maintained roads.

之所以能达到这个数字，原因之一是走海路，用海洋航路运输，比陆路快得多，另一个原因就是修路。

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