screw turn meaning in English

螺丝刀

Simulating analysis for screw turning with envelop method
包络法螺纹车削及其仿真分析
Since he didn ' t switch off the machine before taking this action , the glass safety protection cover wasn ' t open as normal so as he reached he failed to watch out the air cylinder ' s running status while doing this operation , and just at this moment , a block upper the screw turned 45 angles down and cut his little finger ' s fingertip of right hand , the muscle of his little finger ' s fingertip was cut off
因为他没有关掉电源就进行了此操作，玻璃安全保护罩并没有像以往那样打开，所以操作中他并没有看到气压缸运行状态，就在这个时候，螺丝的上边的一块以45度角斜切下来，切到他右手小指的指尖，结果指尖部分的肉被切掉。