Mustard oils are irritants, capable of causing serious injury to animal tissue . 芥子油是一种刺激剂,对动物组织能够引起严重的伤害。
Whereas attractants, repellents, and many incitants are olfactory substances, stimulants, and deterrents are usually gustatory . 引诱剂,排斥剂还是其他的兴奋剂都是嗅觉物质,但刺激剂和阻抑剂常常是味觉物质。
For example , dozens of studies have shown that stimulants improve attentiveness 例如,许多研究表明,刺激剂可改善注意力。
The group did this first by puffing a chemical stimulus into the nose 该小组进行研究时首先对鼻内急速喷入一种化学刺激剂。
Stimulants like ritalin are by far the most commonly prescribed psychiatric medicines in children 象哌甲酯这样的刺激剂是儿童最常用的精神类药物。