1)from top to bottom,由上而下2)"top-down" crack,“由上而下”型裂缝3)blow-and-go,自由上浮4)content free grammar,自由上下文文法5)top-down models,由上至下模型6)emergency free ascent,紧急自由上升
用法例句
In making political restructuring,China often follows two models:“from top to bottom”and “from bottom to top”.