?双面卡其
博客 ... 单面卡其：ONE-SIDED DRILL 双面卡其：REVERSIBLE DRILL 纱卡其：SINGLE DRILL ...
双向风钻
正反转气动钻
He said that's an easily reversible process once the weather passes: Purge the seawater out, pull the packer out and reinsert the drill string to begin drilling again.
CNN: STORY HIGHLIGHTS
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。