But bitter substances block the channels that allow calcium into cells, which relaxes the tightened tissue.

但是苦味物质能够阻碍钙流入气道细胞，所以就能缓解拉紧的组织。

Denatonium, in its marketed form “Bitrex, ” has held the Guinness World Record for bitterest substance for half a century.

苯甲地那铵的市场推广形式是“甲酸苄铵酰胺”，半个世纪以来，它一直是吉尼斯世界纪录最苦物质的保持者。

Caffeine is a bitter substance found in coffee, tea, soft drinks, chocolate, kola nuts, and some medicines.

咖啡因是一种苦味物质， 存在于咖啡、茶、软饮料、巧克力、可乐果和一些药物中。

When the squad took aim, the rage had materialized into a viscous and bitter substance that put his tongueto sleep and made him close his eyes.

当小队瞄准时，愤怒已经化为一种粘稠而苦涩的物质，让他的舌头昏昏欲睡，闭上了眼睛。