名词
中文翻译：青绿色
同义词：
['unripe green', 'undeveloped green']
例句：
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1.The undergreen leaves are a sign of spring.
未成熟的绿色叶子预示着春天的到来。
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2. The young trees are still undergreen, needing more time to mature.
这些年轻的树木还未成熟，需要更多的时间来成长。
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3.The undergreen grass is soft and spongy, perfect for playing in.
未成熟的草地柔软而多汁，非常适合玩耍。