unsaturated monomer

例句：

1. 1. The oil is composed of unsaturated hydrocarbons.
   这种油是由不饱和烃组成的。
2. 2. The food was made from unsaturated fats and oils.
   这种食物是由不饱和脂肪和油制成的。
3. 3. The molecule has an unsaturated carbon-carbon triple bond.
   这个分子有一个不饱和的碳碳三键。