must;have to;need ;

A declining workforce has to provide for an increasing number of retired people.
逐渐减少的劳动人口须要供养越来越多的退休人员.
来源:《简明英汉词典》我们实施的战争,须要如此复杂及详细的维护准备.
来源:词典精选例句He warned himself to be careful, but he wanted, too, to be bold.
他警告着自己,须要小心; 可是他又要大胆.
来源:汉英文学 - 骆驼祥子The company is having to cast around feverishly for ways to cut its costs.
公司迫切须要想出各种降低成本的办法.
来源:《简明英汉词典》An appropriate sense of humility is necessary, especially for small countries.
适度的谦卑是必要的.大国如是, 小国就更须要这么做.
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