useful adj. 1.有用的,有益的,有效的,有帮助的。 2.〔俚语〕值得称赞的,精通…的 (at)。 make oneself generally useful 事事有用,事事帮得来忙 (He must make himself generally useful. 他可事事都干得来)。 a pretty useful performance 相当精采的演出。 His wife is very useful at cooking. 他的妻子很会做菜。 adv. -ly ,-ness n.
mineral n. 1.矿物;〔口语〕矿石;【化学】无机物。 2.〔英国〕〔pl.〕= mineral water. adj. 矿物(性)的;含矿物的;无机的。 the mineral kingdom 矿物界。
Britain had many rivers , which were useful for transport but also for water and steam power . britain also had useful mineral resources 英国许多河流不仅用于交通,还提供水力及蒸汽动力。英国还有可用的矿产资源。