NO01, A divelight is important when you do a night dive.
你夜潜时潜水手电筒是很重要的。
2
On this day I also tested the ballast tank and did a very brief full submergence dive, in the limited light I could not see below the surface and lost sight of the sub right away.
In the light of the poor anti-dive and anti-lift performances of a certain SUV, virtual prototype models of its front and rear suspension systems were built using the virtual prototype technique.