名词
中文翻译：浮渣
同义词：
['slime', 'froth', 'foam']
例句：
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1. The water was so dirty that it left a lot of floc in the sink.
水太脏了，水槽里留下了很多浮渣。
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2. The engineer found that the floc could be used as a natural filter for the water treatment process.
工程师发现这些浮渣可以作为水处理过程的自然过滤材料。
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3. The floc can be seen floating on the surface of the lake, indicating that the water is still polluted.
浮渣可以在湖面上看到，表明湖水仍然受到污染。