介绍了刀具材料、可转位刀具、双向定位刀夹、干式切削、硬态切削等切削技术方面的新进展。
Presented in this paper is a new advance in cutting tool material, index cutting tool, cutter holder for bidirection fixed position, dry type cutting, hard stale cutting etc.
one-to-many和many-to-one的双向关联也是类似的， 当你从多端（子实体）定位到一端（父实体）。
You can make similar arguments for bidirectional one-to-many and many-to-one when you navigate from the one side (the children entities) to the many side (the parent entity).
“作战幸存者/逃逸者定位器”为军事人员提供精确的地理定位信息和安全，超视距（OTH）和视距（LOS）双向数据通信能力。
CSEL provides military personnel with precise geo-positioning information and secure, over-the-horizon (OTH) and line-of-sight (LOS) two-way data communications capabilities.
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