词汇	边坡脚
释义	边坡脚 toe of slope
随便看	single overflow single overhead camshaft single overhead contact line single overload effect single ovum twins single-ovum twins single-owner single-owners single ownership single oxyacetylene welding goggles single oxygen single oxygen generator single pacemaker cell single package single-package unit single-packer test single packet single packet message single-packet message single-packet transmission Single packing single paddle single-page single-pages single pair