It is transmitted exclusively when people who have little or no access to safe-drinking water supply swallow water contaminated with parasite-infected fleas.
该病的传播纯属当人们极少获得或者不能获得安全饮用水供应时饮用了含有受到寄生虫感染的蚤类的污染水。
At this time, I suddenly found that not only was stabbed bird's nest, but also people with a bamboo pole outside to coax Swallow, Swallow in the corridor so that no safe haven within.
这时，我突然发现，不但有人捅燕窝，而且还有人拿着竹竿往楼外哄燕子，使燕子在楼道内无处安身。
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