这项检测已经在药品连锁店和网上销售多年，但是使用者寥寥，部分原因可能是因为其准确性还是个未知数。
The tests have been available in drugstore chains and online for a few years, but their use has been limited, partly because their accuracy was unclear.
为了加强工艺流程顺序中重要和关键部分的安全性，需要采用阀门的锁定装置和连锁装置。
Increased security concerns and critical sequencing of processes have prompted the use of locking devices and interlocks for valves.
为了加强工艺流程顺序中重要和关键部分的安全性，需要采用阀门的锁定装置和连锁装置。
Increased security concerns and critical sequencing of processes have prompted the use of locking devices and interlocks for valves.
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