短语词组短语bobbin case tension spring 梭匣簧Shuttle bobbin case 梭壳bobbin case latch 梭匣柄Threading the bobbin case 底线的穿线方法Shuttle bobbin case latch lever 梭壳针舌杆Shuttle bobbin case latch spring 梭壳针舌弹簧 返回 bobbin case