The seat tilts forward, when you press this lever.
按这个控制柄，座位就向前倾斜。
《牛津词典》
2
The levers and light were set up in exactly the same way except that this time it was only Doris who could see the light indicating which lever to press first.
杠杆和光的设置完全一样，只不过这次只有多莉丝能看到先按哪个杠杆的灯的指示。
3
If the light flashed on and off several times, the dolphins were supposed to press the left-hand lever followed by the right-hand one.