It was a soft cautious tapping on the door of his tree.
那是一种小心翼翼的轻轻的敲门声。
2
But behind each Angle of the walls, behind each door, behind each tree, stood a silent man.
但在每一个墙角上、每扇门后面、每株树的背后，都立着一个不开口的人。
3
I was supposed to give Greene a free hand, but I couldn't go out on a limb by having him knocking on someone's door and telling them they had a tree in pain.