But another machine in the plant, which USES a laser to scan the passing material, can sort plastic by type and colour with great accuracy.

但是工厂里的另一套设备则不一样了。其利用激光对经过的材料进行扫描，按照塑料的种类和颜色进行分类，且准确率极高。

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It works because the receptor proteins in plant DNA respond naturally to threatening stimuli by releasing chemicals called terpenoids to thicken the leaf cuticle, thereby changing its colour.

它的原理在于：当植物蛋白受体受到有害化学物质的刺激时，叶面外皮会释放出一种萜类化合物用以覆盖叶面，因此植物会改变其颜色。

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They have taught plant proteins to change colour when in the presence of certain chemicals.

科学家改变了植物的蛋白成分，当它们暴露于某种特定化学品的时候，植物就会改变颜色。

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Anthocyanins are plant pigments which colour red, purple and blue fruits and flowers.

BBC: A bumblebee extracting nectar and pollen from a snapdragon

The firm has amended its plans after a public consultation, altering the size, colour and equipment to be used in the plant on the one-acre (0.4 hectare) site.

BBC: Artist's impression of the proposed plant

In the Linz steel plant, clean as a whistle and done up in a colour scheme recommended by a feng shui expert, there is hardly anybody to be seen.

ECONOMIST: Who says heavy industry has had its day?