1·Significant advances have been made in the understanding of the biological and chemical nature of olfaction, but many fundamental questions have yet to be answered.
在理解嗅觉的生物学和化学性质方面已经有了重大进展，但许多基本问题仍有待回答。
2·Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。
3·Plastic is burned outdoors and chemical water is poured into rivers, Greenpeace, an environmental group, has found the air, the earth and the rivers in Guiyu badly polluted.
塑料在户外被焚烧，化学药剂被排入河流，环保组织 Greenpeace 发现贵屿的空气、土地和河流被严重污染。
4·Avoid smoking and chemical additives.
避免吸烟和食用化学添加剂。
5·The equilibrium constants and chemical equilibria.
得到了相平衡常数和化学平衡。
6·They frown on monocultures and chemical fertilisers.
他们不赞成种植单一作物和使用化肥。
7·So, what do ants and chemical trails have to do with the web?
蚂蚁和气味跟踪和网络之间有什么联系呢？
8·Petroleum refineries, electrical power plants, and chemical plants.
炼油厂，电厂，化学工厂。
9·Is it just evolution or are there physical and chemical forces at work?
到底是进化还是物理和化学作用的结果？
10·And chemical forms of communications only seem to work over long distances.
而利用化学形式来沟通目前来看最有前途。