useful adj. 1.有用的,有益的,有效的,有幫助的。 2.〔俚語〕值得稱贊的,精通…的 (at)。 make oneself generally useful 事事有用,事事幫得來忙 (He must make himself generally useful. 他可事事都干得來)。 a pretty useful performance 相當精采的演出。 His wife is very useful at cooking. 他的妻子很會做菜。 adv. -ly ,-ness n.
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。