Years to meet the doublespring water, years to meet the doublespring good farm.
年逢双春雨水多，年逢双春好种田。
2
Top flap features a tab closure that secures with a "LRL"-embossed doublespring-action shield lock at the front.
顶部瓣功能封一个标签，“LRL”浮雕双弹簧行动在前面的盾锁保护。
3
Based on the mass-period method, a measuring device named doublespring inversion pendulum was designed, which could measure the center of mass and moment of inertia of an engine.