Animals play an important role in the progress of our human beings.
动物在人类的进步中扮演着很重要的角色。
Cities are crystallization of civilizations of human beings, and urbanization is an important mark of the progress of human society.
城市是人类文明的结晶，城市化则是人类社会进步的重要标志。
The assessment of the fire effluent of the materials is the basic research item to reduce the toxicity to human beings, however, the standardization of the test method has got a very slow progress.
减少火灾烟气毒性危害最基础的工作离不开材料产烟毒性评价，然而试验方法的标准化工作进展缓慢。
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