英语翻译Why is a space between the rails of a railaway line wher

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英语翻译
Why is a space between the rails of a railaway line where one piece jointsthe next?
The space is left to let the rail expand when it gets hot.
On a hot day,the metal expands and if it were not allowed to do this,the rails would bend out of shape.
This has caused railway accidents in the past.
Although solids expand much less than liquid or gases,the small increase can add up to a lot,when there are long lengths of rail.
For example,the difference in length of rail,in summer and winter,over the distance between London and Edinburgh,is about 1/4 mile.
We have to keep in our minds and not forget the expansion of metal when we build a very long metal bridge too.
So spaces are left in the places where themetal is joined.

为什么铁路轨道相接的地方会有空隙呢?
这个空隙是为了在高温天气时防止轨道膨胀而留的.
在高温天气,如果轨道相接的地方没有空隙,那轨道就会因为挤压而变形.以前就因此而发生过事故.
虽然固体膨胀比水和气体要小得多,但积少成多,尤其是当路轨特别长的时候.
例如,伦敦和爱丁堡之间的铁路轨道长度在夏天和冬天的长度相差就将近0.25英里.
在我们修建比较长的金属桥梁的时候,我们同样需要记住它在高温天气会膨胀的这个特性.
所以在金属相接的地方应该留一定空隙.

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