例句與造句

1. Britain had many rivers , which were useful for transport but also for water and steam power . britain also had useful mineral resources
   英國許多河流不僅用于交通，還提供水力及蒸汽動力。英國還有可用的礦產(chǎn)資源。
2. It's difficult to find useful minerals in a sentence. 用useful minerals造句挺難的