Nicaragua sent the soldiers there last year when it began dredging a channel around the island in the San Juan river, which marks the border between the two countries.

去年尼加拉瓜开始派士兵岛这个岛屿附近的圣胡安河上挖通道，圣胡安河是两国的界河。

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Besides the extension length of sedimentation, the factors that effected the river course are channel pattern, process of water and sediment and dredging.

影响河口河道好坏的因素，除淤积延伸长度外，还应包括河槽形态、水沙过程、河口疏浚等。

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