HIV needs to be transmitted inside the body, and cavities such as the anus/rectum and the upper reaches of the agina (particularly around the cervix) provide such an environment.
HIV needs to be transmitted inside the body, and cavities such as the anus/rectum and the upper reaches of the agina (particularly around the cervix) provide such an environment.
HIV必须在身体内传播，而像肛门/直肠以及阴道较上面区域（特别是在宫颈周围）等腔体就提供这样一个环境。