molecules in living organisms

例句：

1. 1. The study of molecules is essential to understanding the structure of matter.
   研究分子对于理解物质的结构至关重要。
2. 2. The molecules in the air are responsible for the smell of fresh flowers.
   空气中的分子负责产生新鲜花朵的气味。
3. 3. The molecules in the water are what make it taste salty.
   水中的分子是使其尝起来咸的原因。