Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.This paper presents the PDC bits with the satisfactory testing result in the multi - interbedded formation.介绍了一种复合式PDC钻头,该钻头在多夹层地层钻井施工中取得了较好的试验效果.A shale for...
a bona fide reason真正原因We simply cannot believe that a bona fide seller would conduct business on this basis.我们简直难以相信一个正当的商人竟然会把自己的生意建立在这样的基础上。We hereby agree with the drawers , endorsers and bona fide holders of drafts.我...
他这个人就爱在心里反复琢磨事儿。He tends to chew things over too much in his mind.我从不闲坐着琢磨：“我接下来做什么呢？”I never, ever sit around thinking, "What shall I do next?"他异常沮丧，反复琢磨。He was uncharacteristically depressed and ruminative....