Although more and more PDC bits are used in drilling operation, but the results of drilling in the hard and soft interbedded formation are not desired.是什么意思_Although more and more PDC bits are used in drilling operation, but the results of drilling in the hard and soft interbedded formation are not desired.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句