1) soft-middle hard formation
软-中硬岩层
2) soft and hard terrane
软、硬岩层
3) medium hard rock formation
中硬岩层
1.
A new type of diamond-impregnated PDC bit was developed according to the characteristics of medium hard rock formation.
针对中硬岩层的特点设计了一种孕镶金刚石复合片钻头,介绍了其切削结构、特点及切削原理。
4) medium hard rock strata
中硬岩地层
5) hard rock interbedded with soft rock
软硬相间岩层
6) soft and hard interbedded rocks
软硬互层岩体
补充资料：怕硬欺软
1.害怕强硬的，欺负软弱的。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条