名词
中文翻译：无衬砌运河
同义词：
['unlined tunnel', 'unlined channel例句：1. The engineers were working on the unlined canal to improve its efficiency.（工程师们正在对这条无衬砌运河进行改造，以提高其效率。）']
例句：
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1. The engineers were working on the unlined canal to improve its efficiency.
工程师们正在对这条无衬砌运河进行改造，以提高其效率。
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2.The construction of the unlined canal has been completed successfully.
这条无衬砌运河的建设已经成功完成。
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3. The unlined canal is a popular tourist attraction in the region.
这条无衬砌运河是该地区的一个热门旅游景点。