helical drilling

• 螺旋钻进

helical drilling的用法和样例：

例句

1. The drill and drilling tools brought advantages in this test, and a lot of construction cautions of auger drilling technology were summarized.
   通过本次试验发挥了钻机及钻具的优势，并总结了螺旋钻进技术一些注意事项。