Because of differences in the expansion rates of the two metals, the thermostatic spring winds up or unwinds with changing temperature.
由于两种金属的膨胀率不同，当温度变化时，恒温制弹簧将卷绕或松开。
2
Youth is the eye lotus spring, third year is that this eye expansion of bubbling spring season.
青春是眼忘忧泉，高三是这眼泉水膨胀冒泡的季节。
3
My company mainly manages the bolt, the nut, the spring nut, the bolt, the gasket, the tooth stick, the expansion of metal screw, the heterogeneous pressing part, non-tender, hardware tool and so on.