Harry could have sworn his over-large nostrils were dilating, trying to sniff Harry out.

哈利敢肯定，他本就大的鼻孔张得更大了，像要嗅出哈利所在的位置。

Lastly, your pupils sometimes dilate if you're in love or if you're aroused.

最后，当你恋爱或被唤醒时，你的瞳孔有时会放大。

With no need for eye drops that dilate your pupils for hours.

如此一，你不需要再检查眼睛前滴上散瞳药水了。

When animals get hot, tiny capillaries near the surface of the skin dilate.

动物热的时候，表的毛细血管扩张。

Also like caffeine, theobromine makes our heart pump faster, our blood vessels dilate, and some of our muscles get more energy, which sounds great!

就像咖啡因，可可碱会促使我们心跳加快，血管扩张，以及让部分肌肉得到更多能量，这听起很棒。

Your heart beats faster, your pupils dilate, and your body releases glucose for additional energy, not because you're in danger but because your body is telling you that something important is happening.

你的心跳加速，你的瞳孔扩大，你的身放出萄糖更多的能量，这不是因为你面临着危险，而是你的身在告诉你这件事十分重要。

If this is inverted, less light coming in, that causes our pupils to dilate and that creates a shallower plain of focus, meaning our eyes have to put more effort into focusing on individual objects.

如果这种情况反过，当更少的光线进入到我们的眼中时，就会导致我们的瞳孔扩大，这就形成了一个较浅的聚焦平面，这就意味着我们的眼睛必须得更加努力才能聚焦到单个物上。

Your pupils dilate when you're scared, nervous or excited.

当你害怕、紧张或兴奋时，你的瞳孔会放大。

This is the most intense phase, but it's also the shortest, and causes the cervix to fully dilate from 7 cm to 10 cm with 100% effacement.

这是最强烈的一个阶段，但是最短的，宫口从7cm完全扩张到10cm，宫颈管100%消失。

When you shine a light on HAL's eyes, his pupils may or may not dilate.

当你用光照射 HAL 的眼睛时，他的瞳孔会根据病情选择性地放大或不放大。

During totality it's dark, so your pupils have dilated to let more light in.

日全食时天空完全黑暗，你的瞳孔会扩张让更多的光线通过。

You might not notice your heart rate becoming irregular, your blood vessels dilating, or your loss of fine motor control, but you will notice something is different as you become " drunk" or " intoxicated" .

你可能不会注意到你的心脏率变得不规则，你的血管扩张，或者你对精确运动控制的损失，但你会感觉到不一样，会感觉到自己“喝醉了”，或者是“中毒了”。

Her face went whiter and her brown eyes dilated enormously.

她的脸色更苍白，那双褐色的眼睛瞪大到了吓人的程度。

It was said to make their pupils dilate so that they would look more beautiful.

据说这能让瞳孔变大，让她们看起更漂亮。

Your ability to sweat, dilating your blood vessels, all those things help promote heat loss.

你的出汗能力，扩张血管的能力，所有这些能力都有助于散热降温。

And this means that those myelin specific T-cells release cytokines like IL-1, IL-6, TNF-alpha, and interferon-gamma, and together dilate the blood vessels which allows more immune cells to get in, as well as directly cause damage to the oligodendrocytes.

髓鞘敏感的T淋巴细胞放细胞因子，比如IL-1、IL-6、α-肿瘤坏死因子、γ-干扰素，一起扩张血管让更多免疫细胞进入，直接损伤少突胶质细胞。

Sexual arousal triggers the parasympathetic reflex that causes arterioles in the external genitalia to dilate and fill with blood, which is actually one of the only times the parasympathetic system controls any arteriole action.

性唤起触发副交感神经反射，导致外生殖器中的小动脉扩张并充满血液，这实际上是副交感神经系统控制任何小动脉动作的唯一时间之一。

At first they used a different chemical called amyl nitrite, a compound that we now know has a nitrite group that dilates blood vessels and lowers blood pressure.

起初，他们使用了一种不同的化学物质，称为亚硝酸戊酯，我们现在知道这种化合物有一个亚硝酸盐基团，可以扩张血管并降低血压。

This is formed by the whole abdomen which acts as a gigantic airbag that the cicada dilates or reduces to modify the quality and power of sounds it emits.

这是由整个腹部形成的，作用就像是一个巨大的气袋蝉，通过扩大或缩小腹部改变发出的音质和音量。

These fast-acting medications cause the smooth muscles in the lungs to relax and therefore dilate the airways, opening them up so that a person can breath.

这些快速起作用的药物可以使肺部平滑肌放松，从而使气道扩张，帮助呼吸。