1. The plane, committed now to landing, to crashing, fell into the wide place like a stone, and Brian eased back on the wheel and braced himself for the crash. But there was a tiny bit of speed left and when he pulled on the wheel the nose came up and he saw in front the blue of the lake and at that instant the plane hit the trees. There was a great wrenching as the wings caught the pines at the side of the clearing and broke back, ripping back just outside the main braces. 2. The hatchet cut through the aluminum as if it were soft cheese. He couldn't believe it. Three more hacks and he had a triangular hole the size of his hand and he could see four cables that he guessed were the control cables going back to the tail and he hit the skin of the plane with a frenzied series of hacks to make a still larger opening and he was bending a piece of aluminum away from two aluminum braces of some kind when he dropped the hatchet. 3. He started chopping again, cutting the aluminum away in small triangles, putting each one on the raft as he chopped—he could never throw anything away again, he thought—because they might be useful later. Bits of metal, fish arrowheads or lures, maybe. And when he finally finished again he had cleaned away the whole side and top of the fuselage that stuck out of the water, had cut down into the water as far as he could reach and had a hole almost as big as he was, except that it was crossed and crisscrossed with aluminum—or it might be steel, he couldn't tell—braces and formers and cables. It was an awful tangled mess, but after chopping some braces away there was room for him to wiggle through and get inside. Can you tell me the meanings of brace according to these three different contexts?