单词：point-source
point-source的用法和样例：
例句
- The specific discharge is infinite at the vicinity of every point source or sink.在每个点源或点汇附近比流量为无穷大。
- Soil erosion and non-point source pollution are two serious environmental issues.土壤侵蚀与非点源污染是两大重要的环境问题。
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