When a star similar to the sun fuses most of its hydrogen into helium, then the helium into carbon, the star becomes unstable and puffs out into a red giant.

当一颗类日恒星大部分的氢聚变为氦，氦又聚变成碳的时候，它就变得不再稳定，而膨胀成一颗红巨星。

youdao

All that carbon and oxygen — byproducts of the helium fusion process — build up in its core. At that point the star will shed its outer layers and the core will form a White Dwarf.

所有氦聚变中的附产物碳和氧在它的核心逐渐积聚，这期间它将失掉较外层物质，核心最终枯萎成为白矮星。

youdao

The newly identified neutron star has a unique atmosphere of carbon just centimetres thick.

新发现的这颗中子星只有单一的碳大气层，厚十余厘米。

youdao

If five-star hotels are a bit too mainstream for you, perhaps you should check out China's first carbon neutral hotel instead.

BBC: The sharpest rooms in Shanghai