适添加的英文：
addition to

There is no room for addition.
没有增加的余地。

addition or extension that prolongs sth
增加或延长的部分.

He is very clever at addition.
他擅长加法。

A new baby is an addition to the family.
新生儿给家庭增加一口人。

Additive was an important for compound fertilizer.
添加剂是复混肥料中不可忽视的组分。