N a ladder used to climb high walls, esp one used formerly to enter a besieged town, fortress, etc 云梯
这是攀墙用的梯子。
The footmarks of pioneers are the starting point of historical progress and the shoulders of explorers are the ladder in scaling new heights in science.
开拓者的足迹是历史前进的起点。奋斗者的肩头是科学登高的阶梯。
The footmarks of pioneers are the starting point of historical progress, and the shoulders of explorers are the ladder in scaling new heights in science.
开拓者的足迹是历史前进的起点。奋斗者的肩头是科学登高的阶梯。
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