The spinal cord is less then two feet in length and is the same diameter as your index finger, yet it contains over 10 billion nerve cells.

脊髓只有不到两英尺长，它的直径也只相当于你的食指粗细，但是在它之中有超过一百亿的神经元细胞。

youdao

But it does have a blunt tip, so that if it accidentally goes into my finger, it's much less likely to perforate."

VOA: special.2010.02.10

Right clicking requires a lifting of the left click finger, just like the Mighty Mouse, though all-in-all it feels much less frustrating to use than the Mighty Mouse, which almost seems to rage against the click at times.

ENGADGET: New iMac and Magic Mouse unboxing and quick hands-on