四代的

A dynamic generating toxic gas system and a nose-only exposure system were used for the pharmacokinetic study of inhaled environmental contaminants for benzene, toluene, xylene, ethylbenzene,chlorobenzene, styrene, isopropyl benzene, tetrachloroethylene, nonane and methylcyclohexane in male guinea pig.

用动态配气设备和鼻式吸入方式染毒，采用雄性豚鼠对环境中10种挥发性污染物(苯、甲苯、对二甲苯、乙基苯、氯代苯、苯乙烯、异丙苯、四氯乙烯、甲基环己烷和壬烷混合物)的吸入动力学进行了研究。

Autotetraploid rice IR36-4X was treated with ion implantation of low energy nitrogen ion beams and a polyembryonic seedling mutant IR36-Shuang was identified in M2 generation.

以低能氮离子束为诱变源，对同源四倍体水稻品系&IR36-4X&进行离子注入，在其第2代群体内筛选得到了1株具有多胚苗性状特征的突变株（IR36-双）。

Article 42 Where a partner has personal debts, his creditors may not subrogate his creditor's rights against such partner for the rights which the partner may exercise in the partnership.

第四十二条合伙人个人负有债务，其债权人不得代位行使该合伙人在合伙企业中的权利。

While the four steps to convert aldehyde- 25 to ester- 29 did not require major modification, vis-à-vis the first-generation synthetic sequence, significant changes were made to the final two steps, that is the conversion of aldehyde- 29 to lactone- 6 , the eastern hemisphere subtarget.

而四个步骤将乙醛25酯-29不需要大修改，相对于第一代合成序列，作了重大修改的最后两个步骤，即把乙醛29内酯6、subtarget东半球。

Surfacing brings together four painters across two generations to investigate the nature of such an unmediated state .

召集了四位艺术家，跨越了两代人来研究这样一个没有界线领域的本质。

Surfacing brings together four painters across two generations to investigate the nature of such an unmediated state.

浮现召集了四位艺术家，跨越了两代人来研究这样一个没有界线领域的本质。

Tetrabromobisphenol-A is the most widely used brominated flame retardant in the world.

四溴双酚－A是一种在世界范围内被广泛应用的溴代阻燃剂。

The wild grass, bush community, artificial mixed forest were regarded and natural secondary forest were regarded as the research subject of different stages in the process of ecological construction aimed at soil and water conservation around Napahai Lake in the northwest of Yunnan Province. The change of those community structures was studied by using spatiotemporal substitution method.

在滇西北高原香格里拉县纳帕海周边区域，以荒草丛、自然恢复灌丛、自然恢复高山松次生林以及人工混交林等四种生态系统类型为研究对象，采用时空互代法，视它们为水土保持生态修复过程中不同阶段，研究不同生态系统的群落结构变化规律。

It the history of CCP,there were four-time scientific definition s of Mao Zedong Thought by our Party s leaders.

在中共历史上，党的三代领导人对毛泽东思想先后做了四次科学界定。

The Mayor of Casterbridge is the fourth of the Wessex novels of the famous English writer,Thomas Hardy.

卡斯特桥市长》是英国作家哈代&威塞克斯小说&的第四部作品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。