An abrupt descent suddenly appeared before him.是什么意思？

An abrupt descent suddenly appeared before him.

他面前突然出现一个陡峭的斜坡。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

abrupt

adj. 突然的，意外的，无理的，唐突的，不连贯的，陡峭的；

例句
Rosie's idyllic world came to an abrupt end when her parents' marriage broke up...
父母婚姻的破裂使得罗茜田园诗般美好的世界陡然画上了句号。

descent

n. 下降，血统，倾斜；

例句
Sixteen of the youngsters set off for help, but during the descent three collapsed in the cold and rain.
16 名年轻人出发去寻求帮助，但在下山过程中有 3 人因寒冷和大雨晕倒了。

suddenly

adv. 意外地，忽然地，奄，勃，霍然；

例句
'It was incredible,' Kurt says, suddenly aglow.
“简直难以置信，”库尔特突然满面红光地说。

appeared

v. 出现( appear的过去式和过去分词 )，出庭（作证或受审），演出，发表；

例句
All in all, it appeared that a pretty depressing summer awaited Jones.
总之，等待琼斯的似乎是一个相当令人沮丧的夏天。

before

prep. 在…之前，先于，优于，当着…的面，与其…；conj. 在…之前，在…以前，比…早些，与其…；adv. 先前，从前，在前，在前方；

例句
He pleaded guilty before a court martial to absenting himself without leave.
在军事法庭上他对自己擅离职守表示服罪。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。