with virtually no safety equipment 事实上没有任何安全措施
by the morning the vast majority will be back in the safety of the cave. 到了早上 大多数蝙蝠 仍会安然无恙地回到洞中
three million bats leave the safety of the cave 300万只蝙蝠一起离开安全的洞穴
they're still held by a silicon safety line. 它们还有一根坚韧的“安全索”
She must soon leave the safety of these nursery slopes 它必须尽快离开这个安全的斜坡“托儿所”