Udl
[计]= Up Data Link,上行数据链路
🗣️ 情景例句
Does the name Harvey Carlson ring a bell?
对Harvey Carlson这个名字有印象吗？
John is not forty-five yet,is he?
约翰不够45岁,是吗？
it would be up and down, to and for and from side to side.
呈现出上上下下、来来回回、左左右右3种性质的运动。