This happens because typically tumors are areas where the immune system has no access, and so bacteria find these tumors and use them as a safe haven to grow and thrive.
这是因为，一般的肿瘤 是免疫系统涉及不到的区域， 所以当细菌发现这些肿瘤时， 会将肿瘤当做避风港， 在其中茁壮成长。