These were large donut-shaped disks made out of limestone.

些巨大的环状圆盘是由石灰石制成的。

Now, you might be asking, " What's that ring around the pan? "

你可能会问，“锅周围的环状物是什么？”

It consists of rings of muscles and a vibrating membrane that controls airflow.

它由环状的肌肉和控制气流的振动膜组成。

Finding the small brown butterflies with golden ring dye spots can be difficult.

寻找翅膀上有金色环状斑点的小棕色蝴蝶并不容易。

The ALMA and GLT improved the resolution and sensitivity of the observations and helped realize the imaging of the ring around the M87 black hole at a wavelength of 3.5 millimeters.

ALMA 和 GLT 提高了观测的分辨率和灵敏度，并帮助实现了 M87 黑洞周围 3.5 毫米波长的环状结构成像。

When they were being formed billions of years ago, a cloud of gas and debris around them began to take the shape of a ring orbiting the planet.

当它们在数十亿年前形成时，它们周围的气体云和碎片开始形成环绕行星的环状结构。

In the bone marrow, immature RBC's mitochondria surround the nucleus and get laden with excess iron deposits, which produces ringed sideroblasts on histology, hence the name of the disease.

在骨髓中，幼红细胞的线粒体围绕着细胞核，并且充盈着大量的铁沉积物，在组织学上形成环状的铁粒幼红细胞，铁粒幼细胞性贫血也因此得名。

Histologically, a prominent feature are their perivascular pseudorosettes, which are ring-like structures formed by tumors cells with rod-shaped ependymal processes, like cilia, surrounding a centralized blood vessel.

从组织学上，主要的特征是血管周假菊形团，由室管膜细胞的棒状突起（如纤毛）形成的环状结构，围绕着中央的血管。

Passepartout was ravished to behold this celebrated place, and thought that, with its circular walls and dismantled fort, it looked like an immense coffee–cup and saucer.

路路通眺望着座名城不禁心旷神怡。依他，座由一些环状的断垣残壁构成的古城，配上旁边那座象个茶杯把子似的破古堡，活象是个巨大的咖啡杯子。

Basically, it has two cyclic structures smushed together and every carbon atom on the ring has another carbon atom hanging off of it.

基本上说，它是两个相互铰链的环状结构，碳环上的每个碳原子都与另一个相连。

Most people felt pretty confident that, that crater was 180 kilometers across based on the most prominent set of circular features there.

多数人很确信，那个陨石坑直径达180千米，是据最主要的一层环状结构测量所得。

First, if the moon shattered into tiny little pieces they might eventually coalesce into a brilliant ringed system around our planet.

首先，如果月球碎裂成一小块一小块的碎片，它们最终可能会凝聚成一个明亮的环状系统，围绕着我们的星球。

These plasmids are small double-stranded DNA molecules that can exist independently of the chromosome and they can be circular or linear.

它们是双链的DNA小分子，可以独立于细菌染色体（拟核）而存在，可以是环状或线状的。

Those rearing clouds begin to neigh a whole universe of auricular cities.

环状的乌云在城市上空尽情咆哮。

They appear as a ring-shaped halo around a lightning strike.

它们起像是雷击周围的环状光环。

It's a circular building made up of curved glass panels, topped with the largest carbon-fiber roof in the world.

那是一个由弧形玻璃板建成的环状建筑，还有全球最大的碳纤维屋顶。

This has created a tremendous donut-shaped radiation belt around Jupiter, like Earth's Van Allen belts, but far more powerful.

就在木星周围形成了一个巨大的环状辐射带，就像地球的范艾伦辐射带一样，但远比范艾伦辐射带强大得多。

Researchers say studying colorized head-on collisions like this helps them better understand how stars and galaxies form in rings.

研究人员表示，研究场精彩的正面碰撞有助于他们更好地了解恒星和星系是如何形成环状的。

The Carina Nebula is an area where stars are forming, and the Southern Ring Nebula surrounds a dying star.

船底座星云是一个“恒星育儿所”；南环状星云由中心的恒星死亡后向外喷发的物质形成。

This heme is a large molecule that's made up of four pyrrole subunits that form a ring, and this structure is called a porphyrin.

血红素是一个由4个吡咯亚基形成的环状大分子，种结构称之为卟啉。