Sam is ten busy connecting the circuit and hanging up circular bulbs on the tree.

山姆十岁了，正忙着连接电路并将圆形灯泡挂在树上。

You can think of it like this: inside our cells, there's different contraptions building things, connecting circuits, doing all the things they need to make life happen.

在我们的细胞里，有许多不同的部件都在造物，连接回路，做所有它们需要做的事情，让生活成为现实。