该针的针柄或针尾设有空气过滤装置和防反流装置。
The needle handle or needle end of the needle is provided with an air filtering apparatus and a back flowing preventing apparatus.
工厂的维修人员已认识到，一个总的集中空气过滤装置不可能始终高效率运转，其滤芯更换周期会引起压缩空气质量的变化。
It has been recognized that a centralized air filter is not running at high efficiency at all times or its cleaning cycles cause variation to the quality of pressurized air.
卫生部重点准备那些带过滤装置的口罩，这种口罩的过滤器可以防止人吸入空气中的一些微粒。
The Department of Health has focused on getting what are known as respirator masks. These have filters, which stop a person breathing in some particles in the air.
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