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

1916 年，一对美国科学家发现了一种更有效血剂，叫做肝素，它通过使可血酶失活发挥作用。

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，它们用其异适应、极其锋利牙齿，在咬住猎物同时将其（皮肤）切开，并且它们（唾液中）自带一种血剂，能使血液不断流出。