At any given time, up to 25% of the body's blood is circulating through the dermis, making this process extremely efficient.

在何时间，超过25%身体血液通过真皮循环。这使得调节体温这个过程非常有效。

Which two layers make up the dermis?

哪两构成真皮？

That proboscis though keeps going into the dermis, since the epidermis just gets oxygen from the air and doesn't have its own blood supply, whereas the dermis does, and this is what our mosquito's after, right, the blood meal.

但喙一直刺入真皮，因为表皮只是从空气中获取氧气，不像真皮有血液供应；这就是目标：血液大餐。

Then it forms dense irregular tissue, whose fibers are thicker and arranged erratically — it's found wherever tension might be exerted in lots of different directions, like the leathery dermis underlying your skin.

然后它形成致密不规则组织，这些组织纤维更厚，排列不规则——何可能向不同方向施加张力地方都能找到它，比如皮面皮革真皮。

And that includes molecules in the dermis like elastin and collagen, creating tangled clumps or breaking them down.

而这些分又包括像真皮中弹性蛋白和胶原一类物质，造成结束或分解。

You can expect even more damage to the lower layer of your skin, AKA the dermis.

你皮，也就是真皮，可能会受到更多损伤。

With this test, tuberculin is injected between layers of the dermis.

在这个试验中，结核菌素注射于两真皮之间。

These microbes, which include bacteria and fungi, thrive in the sebum, an oily substance that's secreted onto the skin's surface by sebaceous glands nestled inside the dermis.

包括细菌和真菌这些微生物，在皮脂内十分活跃，也就是由紧贴在真皮内皮脂腺分泌到皮表面油性物质。

Say you're in the room where you're, like, practicing thumb calisthenics — which probably isn't a thing — but the room is a little chilly, so the blood feeding your dermis loses a lot of heat to that cold air.

假设你在一个房间里，在练习拇指健美操——这可能不是个真事儿——但是房间有点冷，所以供给你真皮血液在冷空气中损失了很多热量。

With less structural support from the dermis, your skin starts to look thinner and build up wrinkles.

你皮也因真皮功能衰退显得更薄，并且产生皱纹。

Made up of three layers, the epidermis, dermis, and hypodermis, skin's thickness varies from 0.5 millimeters at its thinnest and up to four millimeters at its thickest.

表皮，真皮和皮组织。皮最薄处为0.5mm，最厚处为4mm。

The epidermis is supported by the dermis, which is where you'll find nerve endings, sweat glands, hair follicles, and connective tissue.

表皮由真皮支撑，在真皮中有神经末梢、汗腺、毛囊和结缔组织。

As these cells travel through the lymphatic system, some of them are carried back with a belly full of dye into the lymph nodes while others remain in the dermis.

当这些细胞在淋巴系统中运动，有一部分携带着大量颜料进入淋巴结，另外一些依然留在表皮之。

So retinoids can help maintain the structure of your dermis and fight off wrinkles by making your body produce more collagen, elastin, and GAGs.

类维生素 A 能促使身体产生更多胶原、弹性蛋白和糖胺聚糖，从而有助于保护真皮结构，抵抗皱纹。

The needles punch through the epidermis, allowing ink to seep deep into the dermis, which is composed of collagen fibers, nerves, glands, blood vessels and more.

针刺透表皮让颜料深入真皮，真皮之是胶原纤维、神经、腺体、血管等等。

Some of the ink particles are also suspended in the gel-like matrix of the dermis, while others are engulfed by dermal cells called fibroblasts.

有些颜料颗粒悬浮在胶质真皮结构中，而其它颜料颗粒被叫做成纤维细胞真皮细胞吞噬。

The next layer underneath the epidermis is the dermis.

表皮方一次是真皮。

Even worse, that fire causes damage to the dermis, the tissue below the skin.

更糟糕是， 火灾会损坏真皮， 皮组织。

Generally taken from the dermis of the skin.

一般取自皮真皮。

The vessels and capillaries are at the level of the dermis.

血管和毛细血管位于真皮。