In larger stars, pressure at the core is high enough to fuse heavier elements such as oxygen and carbon, creating more photons.
对于更大的恒星，核心的压力大得足以使更重元素进行聚变反应，比如氧和碳元素，它们将创造更多的光子。
2
If it were a mere 4% bigger or smaller than it is, stars would not be able to sustain the nuclear reactions that synthesise carbon and oxygen.
倘若现在该数值仅比过去大或小4%，那么恒星便不能维持合成碳和氧气的各种核反应。
3
The formation of all the other elements - including the carbon, oxygen and nitrogen needed for life - will emerge with the first massive stars millions of years later.