And the reason why is because those thrust levers will be chasing around airspeeds pretty rapidly and it's not necessarily good for the engines.
原因是这些推力杠杆会非常迅速地追逐空速,这对发动机不一定有好处。
英语百科
Thrust lever
Thrust levers or power levers are found in the cockpit of aircraft, and are used by the pilot, copilot, or autopilot to control the thrust output of the aircraft's engines.
In multi-engine aircraft, each thrust lever displays the engine number of the engine it controls. Normally, there is one thrust lever for each engine. The thrust levers are normally found in the aircraft's center console, or on the dashboard of smaller aircraft.