But natural selection is a powerful force, and if the spread of the disease means they have to be used widely, a resistant strain of the virus could easily evolve.
但是自然选择是一种强大的力量，而如果疾病的传播意味着这些药物将被广泛使用的话，一种具有抗药性的病毒毒株可能将轻易地进化出来。
The characteristics of the precocious strain is genetically stable and can't reinstate by relaxing the selection pressures.
并且，早熟株的弱毒性和早熟性具有遗传稳定性，通过放松选择压力反复传代后无恢复现象。
The performance of pressure sensor lies on the design of sensitive girder, selection and sticking of strain gauge and design of metrical circuit.
冲击式谷物流量传感器是常用的测产装置。 流量传感器的性能主要取决于敏感梁的设计、应变片的选取粘贴以及测量电路的设计。
They can muddle, stir, shake, and strain, and are preloaded with 30 spirits and 21 mixers, as well as a selection of garnishes.
他们可以蒙混过关，搅拌，震动和应变，并预装了30烈酒和21混频器，以及选择配菜的。
According to the strain breeding theory, the selection and breeding of antibiotics AGPM producing mutant and the fermentation technology of AGPM were systematically studied in this thesis.
本文根据育种理论，对新型抗肿瘤抗生素agpm生产菌种的选育、发酵法生产抗生素agpm进行了系统的研究。
In this paper, the measurable characters and number of scales in Songpu mirror carp(SP) and German mirror carp selection strain(F4)(DJ) were compared.
对松浦镜鲤（SP）和德国镜鲤选育系（F4）（DJ）的可量性状及体表鳞片数进行比较，SP与DJ的可量性状与体表鳞被存在差异。
The selected mutant has a good genetic stability. It overcomes uncertainty of random selection and the blindness, and increased the efficiency of strain breeding.
得到的突变株遗传稳定性良好，克服了诱变随机筛选的不定向性和盲目性，提高了育种的工作效率。
The selected mutant has a good genetic stability. It overcomes uncertainty of random selection and the blindness, and increased the efficiency of strain breeding.
得到的突变株遗传稳定性良好，克服了诱变随机筛选的不定向性和盲目性，提高了育种的工作效率。
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