382. in ignorance of 不知道…
383. be ignorant of ( = lacking knowledge) 对…不了解,不知道
384. (an) impact (on) 对…的强烈影响
385. impose…on 把…强加给
386. impress…on 给…留下印象
387. make (leave) an impression on sb. =give sb. an impression 给…留下印象
388.under the impression that有..的印象,认为
389. improve sth.(make sth. better)把原物改进 improve on(=produce or be sth. better than…) 另做一物比原物更好
390. improve in (=get better) 有改进, 好些
