under way

The train has had to stop briefly, but it should be under way again soon.这列火车不得不停下来片刻，但它应该很快会再次开动。

The ship finally got under way. [=began sailing]这艘船终于起航了。

Preparations for their arrival are already under way.为迎接他们到来的各项准备工作已在进行中。

A search is under way. [=in progress]搜索正在进行。