The right piece of music at the right time fuses with us on a cellular level.

适当时机，恰到好处的音乐片段 会在细胞层面与我们融为一体。

Today you learned that very low mass stars live a long time, fusing all their hydrogen into helium over a trillion years.

今天你学到了，低质量的恒星寿命很长，在一万亿年间，它们将所有的氢融合成氦。