通行困难
Difficulty in passage
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
航行船只局限于小船，即使在短短夏季数月的无冰期，通行起来也足够困难。
Navigation was confined to shallow vessels, tricky enough even in the few summer months when the river was free of ice.
我们有很多困难的通行证。
We have lots of difficulties to pass.
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