Expensive drugs keep HIV - positive patients alive and healthy, perhaps indefinitely.是什么意思？

Expensive drugs keep HIV - positive patients alive and healthy, perhaps indefinitely.

昂贵的医药费能够抑制HIV阳性患者维持生命,保持健康, 但这一现象是也不太确定(或许还能长期地延续这种状态).

expensive

adj. 昂贵的，花钱多的，豪华的；

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。

drugs

n. 药物( drug的名词复数 )，药剂，麻醉药，毒品；

例句
The testing and approval of new drugs will be speeded up.
新药品的检测和审批速度将会加快。

keep

vt. 保持，保留，遵守，阻止；vi. （食品）保持新，保持健康；n. 保持，保养，供养，抚养，生活，生计，饲料；牧草；

例句
The company say they're able to keep pricing competitive...
该公司说他们能够使定价保持竞争力。

HIV

abbr. hiver (French=winter) （法语）冬季；

例句
...the discovery that both his wife and son are HIV positive.
查出他妻子和儿子艾滋病病毒检测都呈阳性

positive

adj. 积极的，确实的，肯定的，[数]正的，[医]阳性的；n. 正面，正片，[语]原级形容词，[数]正量；

例句
Pupils should be helped to adopt a positive approach to the environment.
应帮助学生对环境采取积极的态度。

patients

n. 患者( patient的名词复数 )，接受治疗者，受动着，承受者；

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

alive

adj. 活着的，活泼的，有生气的，敏感的；

例句
Deptford had come alive with the advent of the new priest at St Paul's.
圣保罗教堂新牧师的到来使德特福德变得生机勃勃。

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。

healthy

adj. 健康的，健全的，大量的，有益于健康的；

例句
Her mother was a dedicated apostle of healthy eating.
她母亲是健康饮食矢志不渝的倡导者。

perhaps

adv. 或许，（表示不确定）也许，（用于粗略的估计）或许，（表示勉强同意或其实不赞成）也许；n. 假定，猜想，未定之事；

例句
I would love to go abroad this year, perhaps to the South of France.
我今年很想出国，可能是去法国南部。

indefinitely

adv. 无限期地，不定期地，不明确地，遥遥无期地；

例句
...the ability to meet human needs indefinitely without degrading the environment.
无限制地满足人类需求而不造成环境退化的能力