Only teak matches oak's expansioncoefficient and stays watertight.
只有柚木才能达到橡木的膨胀系数，并保持水密性。
2
A very low linear expansioncoefficient sample carrier made from invar ensures that temperature change has no effect on the sample position.
由不胀钢制成非常低膨胀系数的样品载台保证温度变化对样品的位置没有影响。
3
Nitrogen is the inert gases, low expansioncoefficient, not easily with the environmental temperature rise for a long time, can maintain normal tire pressure, greatly reduce the flat tire.