Optimally, get one with a HEPA “completely sealed” system.
最好带有HEPA（高效空气过滤器）“完全密封”系统。
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
如果你被关在一个完全密封的房间内，你会先因二氧化碳中毒而死亡，而不会先因缺氧而死亡。
Contacts are completely sealed, enhancing reliability.
密封接点结构，提高了可靠性。
Work at a higher pressure and higher operating temperature range, can be completely sealed.
在较高的工作压力和较高的工作温度范围内，能实现完全密封。
To complete the surgery, the hole in the dura must be completely sealed to prevent leaking of cerebrospinal fluid.
为了完成整个手术，硬脊膜上的小孔必须完全密封防止脑脊液漏出。
The measuring grid is formed by etching Constantan foil, which is then completely sealed in a carrier medium composed of polyimide film.
测量网格是由康铜箔片构成的，然后完全密封于一个由聚酰亚胺薄膜组成的介质载体。
Only one patient had a little contrast in the trachea during X-ray exam but without symptoms, the fistulae completely sealed in 18 cases.
除1例仅放置气管支架者，术后有少量造影剂渗入气管，但没有症状，其余18例造影显示气管食管瘘完全封闭。
Only one patient had a little contrast in the trachea during X-ray exam but without symptoms, the fistulae completely sealed in 18 cases.
除1例仅放置气管支架者，术后有少量造影剂渗入气管，但没有症状，其余18例造影显示气管食管瘘完全封闭。
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