conclude词根词缀单词记忆法:

前缀con-加强意义+词根-clud-关,闭+后缀-e动词词尾

v.断定;推断出;得出结论;(使)结束，终止;达成，订立，缔结(协定);

例句

This has made many Americans conclude that business ethics is an oxymoron.

这使得很多美国人断定商业道德是个自相矛盾的说法。