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海上覆盖着薄薄一层未经处理的污水。
The sea is coated with a film of raw sewage.
《柯林斯英汉双解大词典》
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上游未经处理排出的废污水，造成下游河道污染；
Downstream of the upstream water too much, cause water shortage, block;
youdao
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上游未经处理排出的废污水，造成下游河道污染；
Downstream of the upstream water too much, cause water shortage, block;
youdao