有时，污染物与紫外线可能减弱了两生类的免疫系统，创造了感染的条件，使其更容易被寄生虫入侵。
At other times, pollutants or radiation may set the stage for infection by weakening an amphibian's immune system and thus leaving the animal more vulnerable to a parasitic invasion.
研究生教育所颁授学位分为学术性与职业性学位两类。
Graduate degrees fall into two broad categories: academic and professional ones.
用吸虫器采样法，对双季稻区中处于多样化生境及单一生境中的两类稻田中的节肢动物群落结构特征进行了比较研究。
The community structure of arthropods both in heterogenous and in monotogenous habitat in two-crop paddy field area was studied with the suction sampler.
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