Abel gives him a suspicious quick upward jut of the chin that says, did I sell to you before?

疑快速向上抬起下巴，说道，我以前卖给过你吗？

But I told you it was a delicate question, and warned you to deal with it deftly--to answer it dubiously, and leave them a little in the dark.

但我告诉过你这是一个微妙问题，并警告你要巧妙处理它——疑回答它，让他们蒙在鼓里。

Could be a clearing in the woods surrounded by a bunch of tall trees or a spot where a tree has grown into a curved shape that looks suspiciously like a seat.

能是树林中一块空，环绕着一堆高大树木，也能是一棵树长成弯曲形状方，看起来疑像一张椅子。