实验室要求所有设备在使用前必须保持无菌状态。

The lab requires all equipment to be ___germ-free before use.

手术室必须保持无菌状态。

The operating room must remain ___germ-free.

手术室的器械必须保持无菌状态。

The surgical instruments must remain ___germ-free at all times.