连接 Joining 重力式锁扣 Gravity latch 插销式紧固 Bolt Fasten 摩擦式紧固 弹簧式锁扣 Spring-loaded latch 焊接 Welding 粘结 Gluing 磁力连接 Magnetic Connection 磁力连接 Magnetic Connection 磁吸子母扣 Magnet cup sets