B)pollute 污染,弄脏,腐蚀;pollute air/ water 污染空气/水;All those waste products are polluting the river.所有这些废物都在污染这条河。
C)spot 玷污,认出,发现;He spotted /stained his reputation by lying repeatedly. 他屡次说谎玷污了自己的名誉。spot a friend in the crowd 在人群中认出一个朋友。
D)stain 玷污,染污,染色;stain/ spot ones fingers with ink 使手指沾上墨水;White clothes stain easily. 白衣服容易弄脏。
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