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稠环 [hóu huán]
[有化] condensed nucleus
[有化] condensed ring
[有化] fused ring
[有化] condensed ring
[有化] fused ring
- 在稠环和桥环化合物中，两个碳原子是两个环公用的。
In fused-ring and bridge-ring compounds two carbons are common to the two rings. - 第二是油墨中所使用的颜料、染料中，存在着重金属（铅、镉、汞、铬等）和苯胺或稠环化合物等物质。
Second, the ink that you used for pigments, dyes, in the presence of heavy metals (lead, cadmium, mercury, chromium, etc) and diphen or condensed silatrane, and so on. - 过熟烤烟烟叶的焦油含量虽然较低，但烟气的稠环芳烃类化合物总量与适熟烤烟差异并不明显，其中苯并[a]芘含量有明显升高的趋势。
Although the contents of tar in overripe leaves were remarkably low, the release amount of polynuclear aromatic hydrocarbon was as much as that in mellow leaves.
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