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
造句
用作名詞(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，用紫外光譜和穩(wěn)態(tài)熒光光譜方法研究了它們的光物理性質(zhì)。