extraneous contamination meaning in English

体外污染
外来污染
外原性污染

Gowning worn , personal protective equipment and procedures used in laboratories must be adequate to protect the personnel and , where applicable , to protect the test operation from extraneous contamination
应有防护衣、人防护设备及实验操作规程以避免实验过程中的外界污染。
Gowning worn , personal protective equipment and procedures used in laboratories must be adequate to protect the personnel and , where applicable , to protect the test operation from extraneous contamination
实验室应有足够的防护衣、个人防护设备和操作规程以保护职员，且如果适用的话，避免试验操作受外界污染。