Performance and reliability make shoe-to-shoe drilling more feasible than ever before. With a wide range of sizes, this motor represents a step change in performance for most drilling applications.
以上是斯伦贝谢对井下马达介绍的一段话,其中的shoe-to-shoe drilling是在不知道怎么理解,查询无果,望广大专家及果友不吝赐教