单词：obstructions
n. the physical condition of blocking or filling a passage with an obstruction
n. something immaterial that stands in the way and must be circumvented or surmounted
obstructions的用法和样例：
例句
- They went ahead of us to clear the road of obstructions.他们走在我们前面清除路上的障碍。
- Overcoming obstructions along the route of a sewer can introduce various problems.管道线路跨越障碍会引起各种问题。
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