惹烯

The detection of retene indicated that it is not the unique indicator of higher plants.

惹烯及相关的中间产物在藻类热解产物中的检出，说明它不是高等植物的专一指标。

Retene originated from algae perhaps has same evolution path with that derived from terrestrial higher plants.

源自低等生物藻类的惹烯可能与来自陆源高等植物的惹烯有着相同的演化途径。

Retene, simonellite, pimarene and long side chain indanes were identified in algal pyrolysates for the first time.

首次在藻类热模拟产物中检测到惹烯、西蒙内利烯、海松烯及长侧链二氢化茚类化合物。

In extracts of source rocks of shahejie 1 group of Gulan low-lying abundant retene, simonellite and cadalene were detected. Their main origin should be lower organisms like algae.

在孤南洼陷沙一段烃源岩抽提物中检测到了较为丰富的惹烯、西蒙内利烯及卡达烯，其主要来源应是藻类等低等植物。

Surprisingly, cadalene, retene and perylene, usually used as the terrestrial biomarkers, are abnormally abundant in the Lower Paleaozoic source rocks.

卡达烯、惹烯和苝在下古生界烃源岩中的普遍存在充分说明它们不是可靠的陆源标志物，早古生代繁盛的兰绿藻等浮游植物无疑也是其主要的生物来源。

Retene, dehydroabietin, and 1, 2 ,3 ,4-tetrahydroretene have been identified by GC-MS in extractable aromatic hydrocarbon fractions produced by pyrolysis at 200 and 300 °C of pure strains of the green alga Chlorella protothecoides and the Cyanobacterium Syne-chocystis sp.

在藻类热模拟产物中发现惹烯的存在，提示在解释油气藏的生物母质来源时必须特别谨慎。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。