unsaturated side chain

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 unsaturated fats are considered healthier than saturated fats.
   未饱和脂肪比饱和脂肪更健康。
3. 3.The food industry uses unsaturated fats to make their products more appealing.
   食品工业使用未饱和脂肪来使产品更具吸引力。