coupler draft spring support

例句：

1. 1. The new design of the coupling ensures better fluid flow and reduces noise.
   新设计的耦合器确保更好的流体流动并减少噪音。
2. 2. The pump's ability to draw in air from the atmosphere is crucial for its operation.
   泵从大气中吸入空气的能力对其运行至关重要。
3. 3. The spring supports the weight of the device, ensuring stability during use.
   弹簧支撑设备的重量，确保在使用过程中的稳定性。