up-down

英语音标

英语翻译

adj.升降

英语例句

Window cleaners are pulled up and down tall buildings on cradles. 窗户清洁工乘坐能升降的吊篮清洗高层建筑物的窗子。

The Looper Thread Take-up can make it up and down for threading easy. 升降式底线分线盘，使穿线更容易。