Nuts and bolts, tire reinflated to 200 psi, hubcap back on, and the whole thing is gently lowered 5 centimeters back onto the ground.

安装螺母、螺栓、将轮胎加压到两百磅，安上轮毂盖，把整个轮胎缓慢放低，返回地面。

Investigators have found that four critical bolts were not restored at a Boeing factory to secure the door plug, thereby leading the plug to blow out of the fuselage of a 737 MAX 9 plane in midair.

调查人员发现， 波音工厂能重新安装四个关键螺栓以固定件，导致该件在737 MAX 9飞机飞行途中从机身脱落。

We put extra bolts on the hatches; and, in order to make our sub absolutely silent, we turned off the fans, the cooling system, and all electrical gear.

我们在口上安装了额外的螺栓；而且，为了让我们的潜艇绝对安静，我们关闭了风扇、冷却系统和所有电气设备。