But trains are also large, complicated, and expensive to repair when they break unexpectedly.

但是火车也非常大、复杂，并且在意外损坏时修理费用昂贵。

youdao

But trains are also large, complicated, and expensive to repair when they break unexpectedly.

但是火车也非常大、复杂，并且在意外损坏时修理费用昂贵。

youdao