名词
中文翻译：叶斑
同义词：
['leaf spot', 'leaf spotting', 'leaf stain']
例句：
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1.The leaves on the trees are showing signs of a leaf blotch.
树上的叶子出现了叶斑。
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2.The farmer noticed that some of the wheat plants had developed a leaf blotch.
农民注意到一些小麦植株上出现了叶斑。
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3.The leaf blotch on the apple tree is due to a fungal infection.
苹果树上的叶斑是由真菌感染引起的。