1. Microscopic organisms settle to the seafloor and accumulate in marine mud. 微生物在海底定居并在海泥中积聚。
2. It can contract into the shape of a little round stone, and sit perfectly still on the seafloor. 它可以收缩成一个小圆石的形状，并完全静止地坐在海底。
3. Scientists aboard the Glomar Challenger were the first to discover the existence of domelike masses underneath the seafloor. “格罗玛·挑战者”号上的科学家是第一个发现海底下存在穹顶状物质的人。
4. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetrated the seafloor. 在接下来的几天里，随着钻探作业深入海底，固体石膏样品被不断地被带上甲板。
5. It had, apparently, been fished out of existence; and the once mighty Newfoundland fleet now gropes about frantically for crab on the seafloor. 显然，过度捕捞已经使这里的鳕鱼不复存在了。而曾经很强大的纽芬兰船队现在在海底疯狂地搜寻螃蟹。
