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Another class of drugs is often referred to as downers.
另一類毒品常常被稱為鎮靜劑。
Drugs in this class can decrease the heart rate, make users sleepy and may give users an artificial sense of pleasure -- though this effect fades after a time.
這一類的毒品能夠降低心跳速率，讓吸食者感到困倦，并能讓吸食者獲得一種愉悅的幻覺——雖然這種效果稍縱即逝。
Downers are known to cause headaches, feelings of sadness and a weak pulse.
鎮靜劑據悉可以引起頭痛，傷感和脈搏虛弱。
In some situations, using downers can lead to death.
在一些情況下，便用鎮靜劑可導致死亡。
An example of this type of drug is heroin, which is usually taken as a shot or is sniffed.
這類毒品的一個例子就是海洛因，它被用來注射或者吸食。
Heroin is one of the most powerful drugs in the world.
海洛因是世界上最強效的毒品。
Even a small amount of it is enough to slow the brain and the body's reactions, and heroin users usually become addicted and begin a downward slide after only a few uses of the drug.
即使少量的海洛因已足夠降低大腦和身體的反映速度，而且海洛因吸食者能成癮并且使用極少量毒品時就開始有所反映。
Alcohol is also classified as a downer, and although it is legal, it can damage the liver and do great harm if consumed in large quantities.
酒精也被歸類到鎮靜劑，盡管它是合法的，但它會損害肝臟，如果大量飲用會產生巨大危害。
