shift into second gear 换入二档
drive in second gear 用二档行驶
1. Shift into second gear as you pull away.
起步时请换入二档。
2. The engine roared as I shifted into second gear.
我换入二档时，引擎发出轰鸣声。
A: Why are you driving in second gear?
A：你为什么用二档开车？
B: Because the road is quite steep here.
B：因为这里的路很陡。
1) 汽车的二档
2) 稍微快一点的状态
1. 汽车的二档
e.g.
He shifted the car into second gear.
他把车换到了二档。
noun
1. The second gear in a vehicle's transmission.