The dengue viruses are transmitted to humans through the bite of a female Aedes mosquito, which acquires the viruses while feeding, normally on the blood of an infected person.
登革病毒通过雌性伊蚊的叮咬传播到人类，这要求病毒通过伊蚊的取食传播，通常是一个已感染的患者的血。
Adder venom attacks the blood and nervous system.The venom of an adder bite is less toxic than that of a puff-adder, but it is far more toxic when injected intravenously.
蝰蛇毒素会破坏血液和神经系统，虽然蝰蛇一吻的毒性不如蝮蛇这么恐怖，但如果将毒素注射进皮肤，那毒性就大了去了。
Malaria is caused by a microscopic blood parasite that is transmitted in the bite of female mosquitoes, which need a blood meal to produce their eggs.
疟疾是被雌性蚊子叮咬时传播的一滴微观的血液引起的。蚊子们需要喝足了血来产卵。
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