You let the environment control you and you're simply a person reacting to stimuli.

你让环境控制了你，你只是一个对刺作出反应人而已。

It continues doing this, and the irritant grows into a shiny pearl.

它们反反复复进行着这个过程，这样下去，刺就会长成一颗闪亮珍珠。

Reflex tears, caused by irritants like dust or chopped onions.

反射性泪液，由灰尘或切碎洋葱等刺引起。

It's basically your body's ability to sense chemical irritants.

总体来说就是你身体感受化学刺能力。

Fans are promoting it as a private-sector stimulus (no taxpayers were harmed).

粉丝们推崇其为私营部门刺（没有损害纳税人）。

A third officer sprays him with a chemical irritant.

第三名警官向他喷了一种化学刺。

Alright so people who smoke expose their airways to all sorts of irritants and chemicals.

吸烟使气道暴露在各种刺以及化学质之下。

An asthma trigger is something that makes your asthma symptoms start up or get worse.

哮喘刺会使你哮喘症状出现或恶化。

Two kinds of stimuli were used in the study -- medication or talk therapy.

研究中使用两种刺，或谈话疗法。

The sac coats the irritant with layers of smooth nacre, also known as mother-of-pearl.

珍珠囊给刺外裹一层层光滑珍珠层即珍珠母。

Our devices use colorful and rapid stimulants to mesmerize us into wasting hours of our time.

设备通过丰富多彩快速刺吸引我们浪费数小时时间。

Something was tickling his nose. He managed to tilt away from the irritant, whatever it was.

什么东西使他鼻子痒痒。他极力想把刺弄掉，管它是什么东西。

I used to be quite addicted to stimulants before I made some significant changes in my life.

在我生活中做出一些重大改变之前，我曾经对刺相当瘾。

Associative means that you can connect a stimulus with a sense in your mind, but not experience it.

“联想”指是你可以将刺与大脑中某种感观联系起来，但无法体会到它。

The large center is the manmade irritant placed in the shell to encourage nacre formation.

中间大块是为促进珍珠质形成而放入贝壳中人造刺。

It traps dirt and germs, it keeps water out, and it collects bacteria and other dusty allergens and irritants.

它能够捕获灰尘和细菌，把水挡在外面，收集细菌和其他尘土飞扬过敏原和刺。

Alright, so now let's say that you're at rest, there aren't any drugs or anything stimulating your reward pathway.

好，我们假设正处于静息状态，没有任何或刺来刺大脑奖赏途径。

Our pursuit of pleasure takes many different forms, such as sexual activities, recreational stimulants, and other forms of entertainment.

我们对快乐追求有许多不同形式，比如性活动、娱乐刺和其他形式娱乐。

There's no sustained visual pursuit. You know, you might have just seen him respond to some sort of external stimuli.

没有持续视觉捕捉。我知道，也许你是看到他对外界某种刺产生回应。

In some species, trichomes also dispense chemical irritants.

在某些种中，毛状体还会散发化学刺。