be completely at sea;beside (/wide of) the mark (/point); fail to get the gist (/hang); fail (/unable)to grasp the essence(/main points); impertinent; inconclusive; lose the thread of; make neither head nor tail (of sth); not see what sb is driving at ? 你剛才所說的話～。What you have just said is beside the point. ? 他講了兩個鐘頭，但是他的話讓人～。He talked for two hours but his remarks were neither here nor there.
不得要領(lǐng)
fail to grasp the main point; be not to the point
不得要領(lǐng)bù dé yào lǐnɡ
沒有掌握住事物的要點或關(guān)鍵。fail to grasp the main points, not see what sb. is driving at, beside the mark, in conclusive impertinent, be completely at sea