存在自然障碍与人为破坏是中低产田低产的主要原因。
Both natural and artificial factors contribute to low and middle yield lands.
穿透身体自然障碍的微生物会遭遇到抑制其生长与繁殖的物质(例如干扰素)。
Microbes that penetrate the Body's natural Barriers encounter substances (such as interferon) that inhibit their growth or reproduction.
一旦自然选择塑造了植物的适应机制,使之克服在陆地生活的障碍,植物物种就生机勃勃且丰富多样了。
Once natural selection had shaped the adaptations that helped plants overcome the obstacles to terrestrial living, plants prospered and diversified.
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