Kev ua thiab kev tsim khoom ntawm lub vas kev nyab xeeb

Ib yam khoom siv tiv thaiv kev nyab xeeb uas nrov thoob plaws ntiaj teb. Nws feem ntau siv rau hauv helipad thiab helideck. Lub tiv thaiv kev nyab xeeb tsis yog tsuas yog muaj kev ua tau zoo heev xwb, tab sis kuj txhawb nqa lub zog hluav taws xob, txuag cov nqi zog ua haujlwm thiab txo cov nqi kho.