短语词组短语deformation retract 形变收缩;[数]形变收缩核;形变紧缩核retract line 收缩线Retract Clearance 退刀安全高度Retract Vector 退刀矢量retract indexer 退刀索引器boom retract 动臂缩回eyelid retract 开睑器英语tender retract 提供 返回 retract