Easy to install and process and without any chemical additive.

便于加工安装，不含任何添加剂。

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Is not contain any preservatives or chemical additive of totally environment-protecting anticorrosive anti-insect wood, and has good anticorrosion anti-insect function.

是不含任何防腐剂或化学添加剂的完全环保的防腐防虫木材，具有较好的防腐防虫功能。

youdao

Additive: In foods, any of various chemical substances added to produce desirable effects.

添加剂：任何添加到食品中产生特殊效应的化合物。

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This problem is compounded by the possible presence of multiple chemicals which together have an additive effect that greatly increases the lethal action of any single chemical.

CNN: Chemicals killing Florida birds, fish