还有另一种推测是，人体肠内的寄生虫可以产生抑制免疫系统的化合物。
Another theory is that parasitic worms in our guts can produce compounds that suppress the immune system.
癌症通常是由病毒引发的，而免疫系统会帮助人体抑制住那些病毒。
Cancer growth is often triggered by viruses, and the body's immune system helps keep those viruses in check.
当人体免疫系统强时，癌细胞是会被摧灭的，免疫系统强时能抑制肿瘤形成及扩增。
When the person's immune system is strong the cancer cells will be destroyed and prevented from multiplying and forming tumors.
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