Mr. Weasley started up the engine and they trundled out of the yard.

韦斯莱先生发动了引擎，汽车开出了院子。

Mr. Weasley started up the engine and they trundled out of the yard, Harry turning back for a last look at the house.

韦斯莱先生发动引擎，汽车开出了院子。哈利回头看了这所房子最后一眼。

So the chemistrians decided to trundle out the Romans.

因此， 化学家们决定淘汰罗马人。