The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
| 单词 | low under |
| 例句 |
英语例句库
The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud. 深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。 声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
原声例句
冰与火之歌：权力的游戏（中英对照） Finally Gared looked down. No fire, he muttered, low under his breath. 最后盖瑞低下头。" 那就算了" 。他讪讪地说。 TED演讲（视频版）双语精选 South Korea has spent 210 billion dollars over the last 16 years trying to raise fertility and they keep hitting record lows, under one child per woman on average. 过去 16 年里，韩国投入了 2100 亿美元试图提高生育率，生育率却不断突破历史新低，低于每位女性平均生育一个孩子的水平。 |
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