基本解释n.下笔同根派生 pen-down相关词英汉例句用作名词 (n.)After he finished his exercise,he put down his pen.他做完练习，就放下笔。Tapping the pen twice is equivalent to double-clicking a mouse.轻击两下笔，这相当于双击了鼠标。pen-down更多例句