There must be something wrong with the engine of my car.
我汽车的引擎一定是出故障了。
There must be something wrong with the engine of my car.
我汽车的引擎必须是出故障了。
There must be something wrong with the engine; it's making funny noises.
引擎一定是出了故障，发出一种希奇的杂音。
There must be something wrong with the engine; it's making funny noises.
引擎一定是出了故障，发出一种希奇的杂音。
应用推荐