这架飞机有四个引擎。

This airplane has four ___engines.

这艘船的引擎需要定期维护。

The ship's ___engines require regular maintenance.

科技创新被视为经济增长的主要推动力。

Technological innovation is regarded as the main ___engine of economic growth.

这个游戏引擎可以渲染出非常逼真的画面。

This game ___engine can render incredibly realistic graphics.