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，你的瞳会来让更多的光线通过。

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

动物热的时候，体表的毛细血管。

Her face went whiter and her brown eyes dilated enormously.

她的脸色更苍白，那双褐色的眼睛也瞪大到了吓人的程度。

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

如此一来，你不需要再检查眼睛前滴上散瞳药水了。

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

哈利敢肯定，他本来就大的鼻更大了，像要嗅出哈利所在的位置。

The reason behind this is unclear, but nitric oxide makes peripheral arteries dilate, so blood pressure drops.

其中的原因尚不明确，但是，一氧化氮会致外周动脉，血压因而下降。

If you do try, your muscles will tense and your pupils will dilate and you heart rate will increase.

如果你真的尝试，你的肌肉会紧，瞳会，率会增加。

Music has the ability to create a state of arousal, causing pupils to dilate and blood pressure to increase.

音乐能让人产生情绪起伏，使瞳，血压上升。

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，他的瞳会根据病情选择性地放大或不放大。

Arterioles also have relatively more smooth muscle in their walls, which allows them to constrict and dilate more efficiently.

小动脉壁上的肌肉也相对较光滑，这使它们可以更有效地收缩和。

This is where the arteriole walls develop hyaline deposits, which makes it harder for them to dilate.

这是小动脉壁形成透明沉积物的地方，使它们很难。

The aorta dilates over time, which is a risk for aortic valve insufficiency, where blood leaks back into the left ventricle during diastole.

主动脉逐渐，这是主动脉瓣关闭不全的危险因素之一；这种情况下，舒期时血将反流至左室。

A fetus with such unrestricted access can manufacture hormones to increase the mother's blood sugar, dilate her arteries, and inflate her blood pressure.

这样无限制的接触， 胎儿能通过控制激素来增加母体血糖， 母体动脉，并提高母体血压。

These can let through too much infrared and ultraviolet light, and again can dilate your pupils, actually making things worse.

过多的红外线和紫外线都能穿过他们，同样会使瞳散。实际上让情况更糟糕。

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，可可碱也会促使我们跳加快，血管，以及让部分肌肉到更多能量，这听起来很棒。

The interesting bit is that though your pupils would have dilated you often become effectively blind when you fully engage system two.

有趣的一点，虽然你瞳变大，但是当你完全使用二号系统时，你经常会成为有效率的盲者。

The histamine causes blood capillaries to dilate and become leaky which brings more fluid and immune cells to the area where the mast cells are located.

组胺能使毛细血管的通透性增加，进而促进更多的体液和免疫细胞渗漏到肥大细胞所在处。

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，帮助呼吸。

For example, if you are doing bicep curls, blood must increase to your bicep muscles so we see the arteries feeding these muscles dilating.

例如，如果您正在做二头肌屈曲，血液必须增加到二头肌肌肉，所以我们看到供养这些肌肉的动脉。

In an instant, its whole nature seemed changed; all its past habits were forgotten; every wild impulse was awake; its head erect, its nostrils dilated, its eyes flashing.

瞬间，小鹿的整个性格似乎都变了；它完全忘记了过去的习性；野性的冲动苏醒了；它抬起头，鼻翕，眼睛放光。