In the strength analysis of the pumping jack of a pumping unit, it is very difficult to determine the reference node position under global coordinate system.

在抽油机支架强度分析中， 在全局坐标系下确定主惯性平面方位的参考节点的位置非常困难。

youdao

We were a bit disappointed that the connection didn't come at the hands of a 30-pin jack or Lightning port, but overall the unit worked quite nicely in our limited time with it.

ENGADGET