【The first screw】 in thread has been damaged
如：
the root of first screw in engaging part of bolt 与螺母旋合部分的第一扣螺纹根部
“螺纹第一扣损坏”用英语怎么说?
【The first screw】 in thread has been damaged
如：
the root of first screw in engaging part of bolt 与螺母旋合部分的第一扣螺纹根部