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。
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