尽管固体远不如液体或气体膨胀得厉害，但对于很长的铁轨来说，小的膨胀累积多了就会有很大的增加。
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.
尽管固体远不如液体或气体膨胀得厉害，但对于很长的铁轨来说，小的膨胀累积多了就会有很大的增加。
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.
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