pyran ringpyranoid ring吡喃: pyran; pyrane环: ring; hoop四氢吡喃环: amylene oxide ring呋喃环: furan nucleus吡喃: [化学] pyran; pyrane下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:吡喃环,即可在微信中查询翻译