adrenaline

The body releases adrenaline in response to perceived threats, preparing it for action.身体在感知到威胁时会释放肾上腺素，为采取行动做好准备。

An injection of adrenaline is the first-line treatment for severe anaphylactic reactions.注射肾上腺素是治疗严重过敏反应的首选疗法。