短语词组短语automatic doubler 自动折叠机doubler twister 并捻机derby doubler 条卷机Energy Doubler 能量倍增器doubler circuit 二倍器电路jute doubler 黄麻并拈机Framerate doubler 帧率倍增ktp doubler ktp 倍频器fairy doubler 花式线并捻机 返回 doubler