He didn't do enough preparation for his exam, and failed.是什么意思？

He didn't do enough preparation for his exam, and failed.

他考试前没有充分准备, 结果不及格。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

do

aux. 构成疑问句和否定句，代替动词，用于加强语气；vt. 做，干，进行，从事；vi. 表现，进展，引起，行过；n. 社交聚会，社交活动，宴会；

例句
Rachel was going to do something about Jacob...
蕾切尔将对雅各布有所行动。

enough

adv. 足够地，充足地，十分地；adj. 充足的，足够的；n. 充分，足够，满足；int. 够了；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

preparation

n. 准备，预备，准备工作，配制品，制剂；

例句
You could never eliminate risk, but preparation and training could attenuate it...
风险不可能完全消除，但可以通过防范和培训来降低。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

exam

n. <口>考试，测

例句
The raw exam results make no allowance for social background.
原始的考试成绩是不受社会背景影响的。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

failed

adj. 失败了的，不成功的；v. 在…中失败( fail的过去式和过去分词 )，衰退，衰弱，破产；

例句
They recently failed to negotiate a mutually acceptable new contract.
他们最近未能谈成一个双方都满意的新合同。