and in truth, technological advancement has probably done far more than trade to hollow out the middle class and widen inequality.
而且科技进步在减小中产阶级规模、加剧收入不平等方面造成的影响其实要远远超过贸易的影响。
later, after he taught me the proper use of hammer and chisel, i began to hollow out the hull.
不一会儿,他就教我使用锤子和凿子,我又开始挖船体。
the indians used to hollow out a log to make a canoe.
印第安人过去常挖空圆木制成独木舟。