VOA慢速英语2013.07.14 identified, 入侵者, 英语, system, 免疫系统

Rebecca949

Tiny worms spread throughout the body. This incites the body's immune system to attempt to fight the invader. But the body's intense immune response can destroy the eye nerves.细小的蠕虫会扩散到全身,这会导致人体免疫系统试图抗击入侵者.但人体强烈的免疫反应会破坏眼部神经.
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xiaoxianaibibi

nice