twenty-firsts中文什么意思

num. 第二十一

• firsts:    拣出的最好矿石; 精矿; 一级品
• firsts and seconds:    一级和二级
• twenty:    n. 1.二十，二十个。 2.二十个 ...

例句与用法

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1. the use of integrated pest management will expand in the twenty-first century .
   在二十一世纪，害虫综合治理的应用将扩大。
2. agriculture in the twenty-first century will continue to be plagued by the vagaries of weather .
   21世纪的农业将继续面临反复无常的气候灾害。
3. the urban society of the twenty-first century will have little identity with the agrarian philosophy .
   二十一世纪的城市社会不大会同意农民的哲学。
4. the tests before the united states as it heads toward the twenty-first century are certainly daunting .
   美国迈向21世纪所面临的考验肯定是严峻异常。
5. as we move toward the twenty-first century surely there is the need to dream up new institutions .
   我们在向二十一世纪前进，确实有必要构想新的制度。