Unevenness in the rolling surface requires regrinding of the rails.This grinding result in removal of the hardened areas In the rail head not to mention the high Costs incurred.是什么意思_Unevenness in the rolling surface requires regrinding of the rails.This grinding result in removal of the hardened areas In the rail head not to mention the high Costs incurred.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句