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"Leaf yellowing" 用英语表达为 "yellowing of leaves"。来源是因为叶子黄了，颜色就是黄色。英文例句：
The leaves on the tree have started yellowing, indicating that it may be in distress.
The yellowing of leaves on the plant is a sign of nutrient deficiency.
The leaves on my tomato plants have been yellowing and falling off, what could be causing this?
中文翻译：
树上的叶子开始变黄了，这表明它可能处于困境之中。
植物上叶子变黄是营养缺乏的信号。
我的西红柿植株的叶子变黄并脱落，这是为什么？
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