N-SING The seafloor is the ground under the sea. 海底
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。
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。
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。
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