发布于:2025-07-06 05:59浏览量:100文/优校网
1.测锤(钓丝的)坠子;线锤;铅锤线;锤规;重压物
1.笔直掉下;骤然跌落
1.to fall straight down very quickly from a high position
2.if something such as an amount, rate, or value plummets, it suddenly becomes much lower