armill
n. 臂环:一种戴在手臂上的装饰品,通常由金属制成。
例句
Using water power and having all the functions of the armill ary sphere it was the first astronomical clock in the world.
以水为动力,集浑仪、浑象、报时装置于一体,是世界上最早的天文钟。