This is a narcotic substance.

这是一种麻醉品。

youdao

A certain amount of dreaming is good, like a narcotic in discreet doses.

一定程度的梦想，正如适量的镇静剂，是好的。

youdao

Severe pain after RFA is uncommon, but may last a few days and require a narcotic to provide relief.

RFA后的剧烈疼痛是罕见的，但一旦发生可能会持续数天，需要麻醉剂来缓解痛苦。

youdao

Locals joke that Yemeni trees are actually blue and red, the color of the plastic bags that you get when you buy qat, a mildly narcotic leaf, and the Yemeni national past time.

VOA: standard.2010.04.01

The veterinarian told me that tramadol is not metabolized for a narcotic effect in dogs because their metabolism is different from that of humans.

FORBES: Ann Romney Loves Me Not

Dr Sharma said the new seed has no trace of any of the natural chemicals which cause a narcotic effect - namely, morphine, codeine and narcotine.

BBC: Addictive-free poppy seed developed

Yes, digital narcissism is a narcotic.

CNN: Opinion: Facebook threatens to 'Zuck up' the human race