鲛

与天然气伴生的凝析油具姥鲛烷优势，Pr／Ph高达4～8；

A predominant pristane content in the condensate associated with the gas , Pr / Ph being high to 4 ~ 8 ;

甲醇馏分（F）中主效化感物质为降姥鲛酮-2、棕榈酸甲酯、邻丙基-苯壬酸甲酯等长链脂肪酸系列化合物。

Methanol components ( F ) mainly identified the validity of allelochemicals basking Jiao ketone - 2 , and hexadecanoic acid methyl ester , propyl - benzene nonane fatty acid methyl ester compounds tubes chain series .

有时被认为是鹪鹩科的一个亚科；嘲鸫；猫鹊；长尾鲛。

Sometimes considered a subfamily of troglodytidae : mockingbirds ; catbirds ; thrashers .

这一大群沙丁鱼被一条戟齿砂鲛随尾

this huge shoal of sardines is shadowed by a ragged tooth shark .

他取出一个鲛皮小匣子。

He takes out a little shagreen case .

液态正构烷烃系列、姥鲛烷、植烷碳同位素初步研究

A primary study on carbon isotope of n-alkane , pristane and phytane in crude oil

近代海洋沉积物（层）中姥鲛烷/植烷比值及其地球化学意义

Pristane / phytane ratio in recent marine sediment ( sedimentary layer ) and its geochemical significance

一天，苏立文小姐从浅滩捕获了一条姥鲛似的东西，这种奇异的物种引起了我的注意。

One day Miss Sullivan attracted my attention to a strange object which she had captured basking in the shallow water .

人人都知道沙丘长尾鲛会从沙地下发起攻击，我们在岩石上很安全！

Everyone knew that the dune threshers attacked from under the sand , and that we were safe upon the rocks !

可期待产出与Ef~2泥岩相对应的，姥鲛烷/植烷<0.5，β-胡萝卜烷和伽马蜡烷含量较高的原油。

Oil from Ef ~ 2 shale and having Pr / Ph 〈 0.5 and higher content of β - carotane and gammacerane can be expected .

未成熟生油岩按姥植比划分为两型，即植烷优势型生油岩和姥鲛烷优势型生油岩。

According to the ratio of pristane / phytane , the immature source rocks are divided into two ty - pes : source rock of phytane type and source rock of pristane type .

黄土高原西峰黄土/古土壤剖面过去130kyr正构烷烃组分的平均氢同位素组成变化为-140‰～-190‰。金川泥炭地正烷烃和姥鲛烷分布特征与环境演变关系研究

The δ D values of the n-alkanes from Xifeng loess profile spanning the last 130 kyr show large variations for the past 130 kyr , ranging from-140 ‰ to-190 ‰ . The Study on Relationship between the Distribution of N-alkanes , Pristane and Environment Change in JinChuan Peatland