n.基础横木，地基，地板，卧木...

The groundsill should be firm, otherwise the house would be unstable.屋基务必要打牢一点, 否则盖好的房子也不会结实!...

groundsill的音标：groundsill的英式发音音标为：['graʊndsɪl]groundsill的美式发音音标为：['graʊndsɪl]...