The expansion of metals on heating must be taken into consideration before a long metal bridge is built.
在建造一座大桥前，必须考虑到金属受热膨胀这一因素。
The thermostat is based on the fact that different metals have different coefficients of expansion.
恒温器是以不同的金属有不同的膨胀系数这一事实为根据的。
In such an environment, gold and other precious metals offer some insurance against excessive expansion of money supply.
这种环境下，黄金和其他贵金属为过度扩张的货币供应量提供了一定的风险对冲。
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