Broadly speaking, there are two ways of storing electrical energy in a chemical system.

广义上讲，有两种途径在一套化学系统中储存电能。

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If we can get a self-propagating chemical system that can evolve, yeah, I'd call that life.

如果我们能够得到可以进化的自蔓延化学体系，那么是的，我称其为生命。

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For astrobiologists, life is defined as a chemical system that undergoes Darwinian evolution.

对于天体生物学家来说，生命是作为化学系统来定义的，这符合达尔文的进化论。

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But in an era of plastic explosives and advanced chemical compounds, that system has proved lacking.

VOA: standard.2009.12.30

Don't worry about how they work in the immune system, but what if you could manufacture antibodies then you could make a chemical, an antibody, that is capable of binding to a specific other chemical and you could use that for things.

别管它们在免疫系统内是怎么工作的,只要考虑能不能制造抗体,那么假设你能制造这种化学物质 抗体,抗体又能够同其他特别的化学物质结合,你就可以让抗体为我所用

耶鲁公开课 - 生物医学工程探索课程节选

The drugs appear to boost levels of glutamate, but are designed to target another chemical system in the brain.

BBC: NEWS | Health | Schizophrenia chemical flaw clue

But it appears to be a catalyst-driven chemical system that releases both heat and gas in sufficient quantities to pump the wings up and down.

ECONOMIST: A personal eye in the sky

They focused their work on a chemical messaging system in the brain already known to play a key part in the regulation of mood and anxiety.

BBC: Chemical clue to baby blues found