assure [ə'ʃʊr] 词频1 词根: sur

vt. 向…保证;使…确信;<英>给…保险;

💡 as一再+sure确定→一再确定→肯定，确信

"He hastened to assure us that the press would not be informed."

近义：maintain, assert, asseverate, aver, avouch, ratify 反义：negative, refute, traverse, veto, controvert, disaffirm

close [kloz] 词频1 词根: cl-

adj. 紧密的;亲密的;亲近的; vt. 关;结束;使靠近; vi. 关;结束;关闭; adv. 紧密地; n. 结束;

💡 clud(shut)→关闭；结束；接近的；亲近的；准确的

"a close ally and friend of the prime minister"

近义：lock, seal, shut, quadrate, tally, solemnize 反义：unclose, unlatch, unlock, unseal, unfold, induct

cooperation [ko,ɑpə'reʃən] 词频2 词根: co

n. 合作; 协作;协助;配合;

💡 co共同+operat操作+ion名词后缀→共同操作→合作

"a report produced by the government in cooperation with the chemical industry"

近义：help, assist, assistance, relief, succor, succour 反义：hostility, impugnation, objection, protestation, reaction, recalcitration