手术前需要进行预处理以减少感染风险。

The ___pre-treatment before surgery helps reduce the risk of infection.

手术前，医生建议他先接受两周的药物预处理。

Before the surgery, the doctor recommended two weeks of ___pre-treatment with medication.

木材在涂漆前需要经过防腐预处理。

The wood needs ___pre-treatment with preservatives before painting.