The advantage abruptly turned against them.是什么意思？

The advantage abruptly turned against them.

有利的条件突然变得对他们不利起来。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

advantage

n. 有利条件，益处，优越（性），处于支配地位；vt. 有利于，有益于，促进，使处于有利地位；vi. 得益，获利；

例句
They are deliberately flouting the law in order to obtain an advantage over their competitors...
他们为了和竞争对手抢夺先机而公然无视法律。

abruptly

adv. 突然地，意外地，（言谈举止）唐突地，<地质>陡起地；

例句
She lost the next five games, and the set, as her confidence abruptly deserted her.
她突然自信心全失，接下来连败 5 局，并最终丢了这一盘。

turned

v. （使）转动( turn的过去式和过去分词 )，旋转，（使）改变方向，（使）不适；

例句
With one accord they turned and walked back over the grass.
他们步调一致地转身走过草坪。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

them

pron. 他们，她们，它们；

例句
I take care of them to the best of my abilities...
我尽我所能地照顾他们。