floor sill

基本解释

Study on hydraulic characteristics of transverse vortex behind sill of energy dissipator with step-down floor;
对比常规的底流消能工，对跌坎式底流消能工消能水力特性进行了分析和试验研究。
With rear seats that fold down flat to the floor and a hatchback with a low sill height, the Fit can have an enormous and easily accessible cargo hold.
飞度的后排座椅可以将靠背折叠放平，掀背式的后门加上很低的门槛使得飞度有一个非常人性并且易于存放的行李空间。
laoguoweixiu.blog.163.com
He saw also what had made the crash: a costly porcelain vase which had been standing on the window-sill lay on -the floor broken into about thirty pieces.
他也弄明白了是什么弄出啪啦声来的：原来放在窗台上的一个珍贵瓷瓶，在地板上碎成了三十片光景。