| 单词 | 航行就越困难 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔navigation〕Navigation becomes more difficult further up the river.越往河的上游，航行就越困难。朗文当代〔navigation〕Navigation becomes more difficult further upriver.越往上游走，航行就越困难。韦氏高阶 |
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