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The model also showed that once those T cells are released into the bloodstream, they can effectively attack HIV proteins, even when the virus mutates.

这个模型显示，一旦T细胞释放入血，它们就可以强烈攻击HIV蛋白，即使它们已经变异了。

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After organ transplants, t cells can attack the donor organ as a 'foreign invader'.

器官移植后，T细胞把捐赠器官当作‘外来入侵者’进行攻击。

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"This material doesn't just reveal abuses, this material describes the past six years of war, every major attack that resulted in someone being detained or someone being killed."

VOA: special.2010.07.31

First it was warning shots, but when the Mavi Marmara wouldn't stop, these warnings turned into an attack.

VOA: standard.2010.06.01

"When the forces of the TFG attack al-Shabab and score victories, we don't care from which geographical positions they start the attack,".

VOA: standard.2009.08.20

Obama said the voters would judge Republican VP candidate Sarah Palin, but didn't attack her at all.

NPR: The Hatchet And The Scalpel: A Debate Parable

And, if you can't attack the serve, rallies are over pretty quickly.

BBC: Table tennis plays by the rules

"Don't attack their weakness because their strength is still there, " he said.

BBC: David Campese urges end to England's scrum focus