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。

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A horizontal smoke pipe adopts a spring suspender and a central roller support, and the friction resistance generated by the thermal expansion the pipe when moving is reduced.

水平烟管采用弹簧吊、中心滚动支座，可减少管道热膨胀移动时的摩擦阻力；

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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.

本公司主要经营螺钉，螺母，弹簧螺母，螺栓，垫圈，牙棒，金属膨胀螺丝，异型冲压件，非标件，五金工具等。

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The global expansion that began last spring in less-developed nations is building steam everywhere.

FORBES: The Golden Question

Developing and selling communications equipment requires a significant capital, and Silver Spring will need more money to support its expansion and compete more effectively.

FORBES: Silver Spring Networks Files IPO For Smart Grid Tech

And even the expansion of the Fund which had already been agreed, in the spring, had not yet been ratified.

BBC: Central banks and the 'spirit of 2008'