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Looking beyond the 10-year period , the botanists estimate that some 3,000 native plant species may become extinct in the foreseeable future — more than 10 percent of the approximately 25,000 species of plants in the United States
在展望 10 年后的情况时植物学家们估计,在未来可预见到的时间内,3 000 种本地植物——占美国近25 000 种植物的 10%——将可能灭绝
(GIS 学习网:)2
The annual migrations of wildfowl and many other animals certainly cannot be regarded as a form of exploration , because such movements are actually only shifts from one habitat to another for the purpose of avoiding seasonal climatic variations
野生禽类和许多其他动物每年的迁徙,当然不能被看做是一种探险行为,因为,这些迁徙活动实际上只是从一个栖息地转移到另一个栖息地,以躲避气候的季节性变化
Proponents of G-M foods argue using biotechnology in the production of food products has many benefits: it speeds up the process of breedin