Many have assumed that humans ceased to evolve in the distant past, perhaps when people first learned to protect themselves against cold, famine and other harsh agents of natural selection.
很多人认为，在遥远的过去，人类通过了饥饿、寒冷等自然选择的严峻考验后，便不再进化了。
The antifoaming principles of antifoaming agents were analyzed in theory, and the selection principles and evaluation methods were described.
从理论上分析了消泡剂的消泡原理，概述了消泡剂的选用原则及评价方法。
The recent studies are focused on the selection of the cleansing agents and the treating methods.
目前研究的重点在于处理剂和处理方式的正确选择上。
A theoretical basis was proposed for the selection of high temp. dispersant levelling agents.
这为高温分散匀染剂的选择提供一定的理论基础。
The selection of main reagents and screening agents has been introduced for measuring the calcium fluoride in fluorite by EDTA volumetric method.
介绍ED TA容量法测定萤石中氟化钙时所使用的主要试剂、掩蔽剂等的选择。
The PLA formation is affected variously by various antiplatelet agents. Monitoring of PLA formation is helpful in guiding the clinical use and selection of antiplatelet agents.
不同的抗血小板药物对PLA形成的影响有所差异，监测pla有助于指导抗血小板药的临床应用和筛选。
The process features and the development of hydrophobic polypropylene fiber were introduced. The selection, use and amount of hydrophobic oil solutions and antistatic agents were discussed.
介绍了疏水性聚丙烯纤维的生产工艺特点及其开发过程。着重对疏水性油剂和抗静电剂的选择及其使用方法、用量等进行了分析与讨论。
The polymerization of fourteen N-phenyl unsaturated dicarboximides were studied for the selection of capping agents of "PMR" polyimides.
研究了十四种不饱和羧酸酐的N -苯基二酰亚胺的热聚合反应，以此作为“PMR”聚酰亚胺封端剂的选择。
Vision of distributors and agents, in the selection of projects, there should be more forward-looking in this area.
有眼光的经销商和代理商，在选择项目的时候，更应该有这方面的前瞻力。
Selection of water activity lowering agents for low sugar preserved fruit and vegetables were studied in this paper.
对低糖果蔬脯水分活度降低剂进行了选择研究。
Printing process of knitted goods is introduced, requirements on the greige quality, pretreatment, dyestuff selection as well as anti-staining agents are put forward.
通过分析针织物的印花工艺，提出了对坯布质量、前处理、染料选择和防沾污剂等的要求。
It also discusses the harm in detail according to the comparison of acid gases between different. the research provides selection of fire-extinguishing agents in terms of harms.
从灭火过程中副产物的毒害性出发，为灭烃类火灾时灭火剂的选择提供理论依据。
Conclusion Selection of suitable contrast agents, use of preventive medicine and effective nursing are means of relieving and reducing side effects of contrast agents.
结论根据病情选择合适的造影剂、预防用药、有效护理是减轻和减少造影剂副反应发生的有效方法。
This paper introduced the principle of floating deink, the application and selection of deink-agents and surfactants widely used in wasted-paper deink.
介绍浮选法废纸脱墨的原理，脱墨过程中脱墨剂的作用机理、选择和应用情况。
The definition, present epidemiology and etiopathology of MDR-TB and the therapeutic principle, drug selection and new chemotherapeutic agents for the treatment of MDR-TB were discussed.
就其定义、流行病学现状、产生机制、治疗原则及药物选择、新的药物治疗作一简要概述。
Sales agents′solution to sales channel conflict affects the efficiency and output of sales channels. However, their selection of solution is decided by their satisfaction.
分销商解决冲突的方式影响分销渠道的效率和产出，而分销商满意度的高低又决定了其所采取的方式。
In order to obtain better semi-bright nickel coating, a new process was studied based on the selection of additive agents for semi-bright nickel electroplating solution with hull cell tests.
为获得较好的半光亮镍镀层，通过霍尔槽试验对镀镍液添加剂进行筛选，研究一种半光亮镀镍工艺。
Pigment dyeing technology of ramie and cotton - ramie fabrics was investigated with the emphasis on the selection of adhesives and other dyeing auxiliaries, and the softening agents.
本文探讨了涂料在苎麻、棉麻织物的染色工艺，重点对染色助剂粘合剂及柔软剂进行了筛选。
The siting of facilities used in conformity assessment procedures and the selection of samples are not such as to cause unnecessary inconvenience to applicants or their agents;
合格评定程序所用设备的设置地点及样品的提取不致给申请人或其代理人造成不必要的不便；
Its catalytic repertoire expanded by modification and in-vitro-selection of nucleic acid libraries endows ribozymes a great potential as gene therapeutic agents and nucleic acid probes.
对天然核酶的改造和人工核酶的筛选使核酶的催化反应谱得到了扩展，也为核酶作为基因治疗药物和核酸探针提供了多种选择。
Its catalytic repertoire expanded by modification and in-vitro-selection of nucleic acid libraries endows ribozymes a great potential as gene therapeutic agents and nucleic acid probes.
对天然核酶的改造和人工核酶的筛选使核酶的催化反应谱得到了扩展，也为核酶作为基因治疗药物和核酸探针提供了多种选择。
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