Mosquito saliva is an anticoagulant, meaning it prevents blood-clotting, allowing blood to travel smoothly and efficiently from person to mosquito.

蚊子的唾液是一血剂，意味着它可以防止血液固，使血液在人与蚊子之间顺畅有效地流动。

In 1916, a pair of American scientists found an even more effective anticoagulant called heparin, which works by deactivating enzymes that enable clotting.

1916 ，一对美国科学家发现了一更有效的血剂，叫做肝素，它通过使可血的酶失活而发挥。

And then they have these specially adapted, very sharp teeth which cut as they bite, and then they actually have an anticoagulant, and that helps it to continue bleeding freely.

然后，它们其这些特异适应、极其锋利的牙齿，在咬住猎物的同时将其（皮肤）切开，并且它们（唾液中）带一血剂，能使血液不断流出。