HSK 7-9
缕
lǚ量
strand; thread; detailed; in detail
一缕阳光穿过厚厚的云层。
Yìlǚ yángguāng chuānguò hòuhòude yúncéng.
A ray of sunlight passed through the thick clouds.
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Also free:
Appears across levels (7-9) in the HSK 3.0 word list.