Prior to 1815, western farmers who did not live on navigablewaterways were connected to them only by dirt roads and mountain trails.
1815年之前，那些没有生活在通航的水路旁的西部农民只能从土路和山道前往那些航道。
2
China has 123,000 km of navigablewaterways, of which 61,000 km are officially classified for commercial navigation purposes.
中国约有12.3万公里可通航的河道，其中6.1万公里为商业运输航道。
3
In this paper, introduce the characteristics of flow athletics of the cecal channel and influencing factors, the width of navigablewaterways and their impact on the safety of navigation of ships.