a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar
the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it
例句
用作名词 (n.)
A series of new pyrene derivatives have been synthesized, and the photophysical properties have been studied by UV-absorption spectra and steady-state fluorescence spectra. 本文合成了一系列新的芘衍生物,用紫外光谱和稳态荧光光谱方法研究了它们的光物理性质。