Significant advances have been made in the understanding of the biological and chemicalnature 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
A summary of the physical and chemicalnature of life must begin.
简要介绍了物理和化学性质的生活必须开始。
3
The plant's absorption of lead relates to the physical-chemicalnature of the soil.