2.形容词、副词
severe → serious(严重的) a severe water shortage严重缺水
needy → poor( 贫穷的)
wealthy → rich ( 富裕的)
beneficial →good (有益的)
undesirable → bad (不好的，不受欢迎的)
significant →important( 重要的)
relevant → related (有关的) ....is highly relevant to.......
extremely → very (非常的)
