The first bite draws blood, and blood draws a pack of piranhas.
第一口咬出来的血散开了，会引来大量的食人鱼。
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。
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