additive

Many processed snacks contain a chemical additive to keep them fresh for a long time.

(Chinese) 许多加工零食含有化学添加剂，以保持长时间的新鲜。

This fuel additive is designed to clean the engine and improve gas mileage.

(Chinese) 这种燃油添加剂旨在清洁发动机并提高燃油效率。

The total score is calculated using an additive process where points from each round are summed.

(Chinese) 总分是通过加法过程计算的，即把每一轮的分数相加。

Color mixing on a computer screen is an additive process involving red, green, and blue light.

(Chinese) 电脑屏幕上的色彩混合是一个涉及红、绿、蓝光的加色过程。