名词
中文翻译：可见的冠状直径
同义词：
['visible crown radius', 'visible crownradius diameter']
例句：
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1.The diameter of the tree's trunkis visible from a distance.
从远处可以看到这棵树的主干直径。
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2. The diameterof the new road issignificantly larger than that of theold one.
新路的直径比旧路大得多。
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3. The diameter of the planetMercury is about half the size ofEarth's.
水星的直径大约是地球的一半。