He fell down with a bump.

他噗通一声倒了下去.

The box fell on the floor with a bump.

箱子碰地一声落到地上。

That bad failure brought them down to earth with a bump.

那次惨重的失败才使他们猛然知道天高地厚.

The results showed that when fuel spray impinges on a plane wall, wall jet was formed; while fuel impinges on a plane wall with a BUMP, a secondary jet can be formed.

在燃烧室壁面上加上限流沿后，发现壁面射流在遇到限流沿后从壁面剥离，在空间形成二次射流。