How exactly the chemical plays a role still remains a mystery.

这种化学物质究竟是如何发挥作用的仍然是一个谜。

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So bitmaps play a useful role, but for those images that can be decomposed into basic shapes such as diagrams, logos, and chemical formulas, a vector file format is inherently more efficient.

因此位图的地位依然很重要，但是对于那些可以分解成基本形状的图像，比如图表、标志、和化学公式等等，矢量文件格式天生就具有较高的效率。

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Faraday not only became Davy's chemical assistant, but eventually assumed his role. In 1821 he discovered electromagnetic rotation, the principle behind the electric motor.

法拉第不仅成了戴维的化学助手，而且最终自己也展露了头角。

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London 2012 chairman Lord Coe has defended the role of chemical company Dow in providing a fabric wrap around the Olympic Stadium in east London.

BBC: A computer generated image of how the wrap will look

These cells produce dopamine - a chemical which plays a key role in movement.

BBC: NEWS | Health | Activity 'cuts Parkinson's risk'

These were into the role of a chemical called dopamine in the transmission of signals across the synapses between nerve cells in the brain.

ECONOMIST: The Nobel prizes