In another heat-preserving response -- called vasoconstriction -- blood vessels temporarily narrow.

在另一种称为血管收缩的保温反应中， 血管会窄。

If you were to put yourself into a cold environment, we would experience in our vasculature, something known as vasoconstriction.

如果你把自己放在一个寒冷的环境中，我们的血管统就会出现一种叫做血管收缩的现象。

It's also metabolized by the liver, and cocaine causes capillaries in the mouth and esophagus to constrict, making it harder for it get absorbed.

可卡因被肝脏代，够导致口腔毛细血管和食管毛细血管的收缩，这使得药物更难被吸收。

Also use of certain drugs are risk factors, like cocaine and methamphetamine because these can cause significant vasoconstriction of the placental blood vessels and an abrupt increase in blood pressure, increasing the risk of an abruption.

危险因素还有使用某些药物，如可卡因、脱氧麻黄碱，因为它们会导致胎盘血管的收缩和血压的突然升高，增加胎盘剥离的风险。