@wsbgnl Use of PPE is a hazardous environment (eg. workplace) is effective and is NOT analogous to one way masking, because when one must remove the PPE, one LEAVES THE HAZARDOUS ENVIRONMENT before doing so. This often can't be done by individuals in many public settings.
@wsbgnl使用PPE是一种危险环境（如工作场所），是有效的，与单向掩蔽不同，因为当必须移除PPE时，必须在移除前离开危险环境。在许多公共场合，个人往往无法做到这一点。