1. Yes, they might block the urinary tract. 是的，他们有可能会阻塞尿道。
2. HPVs also can be transmitted by skin contact and are found in the mucus of the genital tract, and in saliva, urine, and semen. 人乳头状病毒也能通过皮肤接触传染，并且在生殖道的粘液中、唾液、尿液和精液中也能找到它们。
3. Glutathione deficiency also adversely affects other systems and organs such as the lungs, the nervous system, and the intestinal tract. 缺乏谷胱甘肽对于其它系统或器官如肺脏、神经系统及肠道也都有不利的影响。
英英解释
n.
1. an extended area of land
2. a system of body parts that together serve some particular purpose
3. a brief treatise on a subject of interest; published in the form of a booklet
4. a bundle of myelinated nerve fibers following a path through the brain
