But,they warn that persons with weakened defenses for fighting disease are at greater risk.

VOA: special.2009.10.13

The son probably died of TB, but it related to all this other business in his weakened state.

他最终可能死于肺结核,但这也和他一落千丈的地位有关

耶鲁公开课 - 欧洲文明课程节选

Fungi which don't often cause infections in people with healthy immune systems but can under some circumstances, and can be tremendous problems in patients that have weakened immune systems.

真菌在免疫系统健康的情况下通常,不引起感染,但在某些情况下也会感染,那就成了极大的问题,在免疫系统脆弱的病人体内

耶鲁公开课 - 生物医学工程探索课程节选

But for a moment, his self-control weakened.

VOA: special.2009.12.24

Whitman notes that the report says violent groups have been weakened, but are still capable of conducting large attacks.

VOA: standard.2009.03.31

But MEND has been severely weakened since dozens of its field commanders and thousands of gunmen accepted President Yar'Adua's amnesty offer and disarmed.

VOA: standard.2009.12.21