名词
中文翻译：棕色斑块
同义词：
['brown spot', 'brown stain例句：1. The old man had a brown patch on his shirt.（老人的衬衫上有一块棕色的斑点。）2. The dog has a brown patch on its belly.（狗的肚子上有一块棕色的斑点。）']
例句：
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1. The old man had a brown patch on his shirt.
老人的衬衫上有一块棕色的斑点。
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2. The dog has a brown patch on its belly.
狗的肚子上有一块棕色的斑点。
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3. The farmer noticed a brown patch on the field.
农民注意到田地上有一块棕色的斑点。