Usually, this is below the maximum available  level, and is known as a derated thrust takeoff.

通常，这低于最大可用水平，称为降额推力起飞。

Indeed, the use of derated thrust in the first place, as well as the  length of runways in general, makes this possible.

事实上，首先使用降额推力，以及一般的跑道长度，使这成为可能。