轿车用的三角轮胎质量:sofa是什么？

sofa是什么？ sofa是什么? 关于sofa的疑问 是on the sofa还是in the sofa? couch和sofa的区别？ 跪求英语高手 sofa patato microfiber sofa bed 是什么意思?请教沙发行业的前辈 Mattress-on-the-floor sofa-beds，帮忙翻译啊 tom lay under a sofa as quickly as possible tom lay under a sofa as quickly as pooible