例句：
Lawlessness is a major problem.
違反法律是一個(gè)嚴(yán)重的問(wèn)題。
The problem is well documented.
這個(gè)問(wèn)題有很多依據(jù)。
The problem won't just disappear.
這個(gè)問(wèn)題不會(huì)就這樣不了了之的。
That's a very hard question.
那是個(gè)很難的問(wèn)題。
He couldn't answer the question.
他沒(méi)有能回答那個(gè)問(wèn)題。