通孔Through hole通孔[tōng kǒng]词典through-hole; [无脊椎] pylome例句:在连接块上的至少一个通孔带内螺纹。At least one of the through-holes in the block is internally threaded.盲孔Blind hole盲孔词典[化] blind hole; [医] foramina caecum例句:曲轴箱中气缸盖紧固螺钉的盲孔中不得有油或冷却液。There must be no oil or coolant in the blind holes for the cylinder-head fasteningscrews in the crankcase.