Answer:
It is standard procedure to wear both space suits and hearing protectors in laboratories.
Step-by-step explanation:
In this excerpt, there is a description of how are Nancy and her colleagues being prepared for dealing with materials in a laboratory. Her dressing is described in the details. There are also comments connected to the explanation of why are they so cautious. Their preparation is the first step to insure themselves in a possibly dangerous situation. The writer uses allusion to give this excerpt a more detailed and colorful description of two people who are preparing to enter in laboratories. Wrestlers are used as symbols for fighting, but in this situation, they are showing concern for safety.