“凿孔于”可以翻译为 "drill a hole in" 或 "make a hole in" (具体根据语境选择),若要更贴近“凿孔于(某物)”这种表达,可说成 "drill/make a hole in [the specific object]" 。
例如:
他们在墙上凿孔于合适的位置。(They drilled a hole in the appropriate position on the wall. )
工匠凿孔于木板以安装铰链。(The craftsman made a hole in the wooden board to install the hinge. )