Some experts believe that they boost their immunity through simple lifestyle habits.

专家们认为他们通过简单的生活方式和习惯提高了他们的免疫力。

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Both Hudson tomcod and New Bedford killifish, however, have unusual AHR molecules. And it is this that seems to explain their immunity.

然而，哈德森的鲟鱼和新贝德福德的鳉鱼有着不同寻常的AHR，这正是他们免疫力所在。

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Unless they can prove that they are using their immunity to benefit customers, they may come to regret ever having applied for it in the first place.

除非航空公司可以利用豁免权是乘客受益，否则他们会对首当其冲的申请豁免权感到懊恼。

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Newborns need a vaccination within the first day of life to prevent transmission of the virus from their mothers, and babies need two more doses within the first six months for full immunity.

VOA: standard.2010.07.26

And he was right; they got immunity and were protected from smallpox when it affected their community.

他是对的,当天花在周围流行时,他们具备了对天花的免疫力

耶鲁公开课 - 生物医学工程探索课程节选

"It just is not a good idea." Swine flu parties are the latest version of chickenpox parties, where parents encourage their kids to share lollipops, spoons or whistles to spread the disease and get immunity.

VOA: standard.2009.12.18

However, Sunday's detentions were the first since contractors lost their immunity under a joint U.S.-Iraqi agreement.

CNN: Briton held over death of 2 contractors in Baghdad

Removing their immunity would favour British firms, which are generally less twitchy about operating under other countries' laws.

ECONOMIST: Iraq

However, their immunity to privatisation, enshrined in state laws, is a big obstacle.

ECONOMIST: German public-sector banks: Slow progress | The