diameter of bore meaning in English

内孔直径
钻孔直径

Tubular heat exchangers ; tube pitches , diameter of bores in tube sheets , baffles and support plates
管式热交换器.管心距管薄板的钻孔直径.挡板和支承
( 4 ) diameter of bore for anchor bolt is 50mm , and diameter of reinforcing steel bar is 28mm . both break through the rules which request that the bore diameter should be bigger than the steel bar diameter trebly or not smaller than the steel bar diameter adding 50mm
( 4 )设计锚孔直径50 ，锚筋直径28 ，突破了规范关于锚孔直径需大于锚筋直径3倍或不小于锚筋直径加50mm的规定。