短语词组短语billow plug forming 模塞助压气胀成型billow w forming 热胀成型billow drape forming 气胀覆盖成型billow forming with air cushion 气垫气胀成型billow forming with reversed draw 反吸气胀成型billow snap -back forming 气胀快速反吸成型 返回 billow forming