soundproof的一般过去时怎么写

adj.隔音的vt.给（房屋等）装以隔音设备，使隔音...

soundproof的音标：soundproof的英式发音音标为：['saʊndpru:f]soundproof的美式发音音标为：['saʊndˌpruf]...

soundproof的现在完成时为：soundproofed...

soundproof的现在进行时为：soundproofing...

The studio isn't soundproof.这个摄影棚并不隔音。This material is soundproof.这材料是隔音的.These boxes were usually old freight cars that were almost soundproof.这些包厢通常采用几乎能隔音的旧火车货柜....

soundproof的第三人称单数（三单）为：soundproofs...