It turns out there's actually no natural function known in the body for lithium.

事实上我们已知的身体机能,在正常情况下根本不需要锂。

麻省理工公开课 - 化学原理课程节选

Dr Ip looked at which genes were active in the gill-like structures of the mouth and found one that appears, from its similarity to genes of known function from other species, to encode a urea transporter.

ECONOMIST: Softshell turtles urinate through their mouths

It is a software maker largely known for function, but has also built a gaming system ideal as a TV streaming device.

FORBES: Microsoft Tablet vs. iPad Is Nonsense, But An XBox Tablet ...

And many of the nutrients associated with brain function are known to affect transmission at the synapses.

ECONOMIST: Eat your way to a better brain