The trees lining the road stand bolt upright, just like two green walls.

两边的树笔直笔直的，像两道绿色的墙。

youdao

So ears of corn when young and light , stand bolt upright , but hang their heads when weighty , full , and ripe.

所以玉米穗青葱之时都挺直而立，成熟结实之后则垂下头来。

youdao

Contestants get one five-minute break every hour, but otherwise must stand bolt upright with one hand on the pickup at all times.

ECONOMIST: Pickup country