潜水艇没等军舰靠近就及时潜入水下了。The submarine had had time to submerge before the warship could approach.不一会儿, 潜水艇内所有的东西都扣紧了.Within a short time, everything on the submarine was buttoned up.我们用声呐系统观察到两条潜水艇.We picked up two submarines ...
She was flossing her teeth at the time.当时她正在用牙线剔牙。Flossing is no longer freakish.用牙线剃牙不再古怪.Recent studies make a direct connection between longevity and teeth flossing.最近的研究表明:长寿跟用牙线洁齿直接相关.In addition, flossing regularly...