Who said that you need to do boring crunches and push-ups and run around the block every day?
谁说你每天要做乏味的仰卧起坐和俯卧撑以及围着大厦跑步？
The switch block adjusts the position of the flow passage by a spring and a push pressing block, so the switch block has the function of opening and closing the toothpaste passageway.
开关块通过弹簧、推压块调整流道的位置，起到开、闭牙膏通道的作用。
The hollow sliding cylindrical body, the air pipe, the hollow sliding block, and the hollow push rod are connected into integration.
中空滑动柱体、气管、中空滑动块和中空推杆连成整体。
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