The dyes in question are fluorescent-having absorbed the light , they re-radiate it .
正在讨论的染料是荧光的,能吸收和再辐射光。
To date , lasers have been built from inanimate materials , such as purified gases , synthetic dyes or semiconductors .
迄今为止,激光器一直都用没有生命的材料制成,比如净化的天然气、合成的染料或者半导体。
Dyes can contain heavy metals .
染色用的染料还可能含有重金属。
Alum is used in the textile industry as a way of making dyes bind to cloth .
明矾在纺织业里是被用来使染料粘上布料。
The microparticles are tiny bubbles whose surfaces are membranes already used clinically to administer chemotherapy drugs and ultrasound dyes .
一种微粒是微小的气泡,它的表面是几层膜,已经应用于临床给予患者化疗药物和超声波染料。
In the past , red dyes were expensive , so red walls and fabrics suggested luxurious wealth , importance or ill repute .
过去,红色染料都很昂贵,因此,红色的墙和织物意味着奢华、财富、重要性和坏名声。
There has been a push in recent years to encourage more revellers to use organic and environmentally-friendly dyes to avoid health risks .
最近几年,人们一直都在努力,去说服更多的狂欢集会者使用有机环保的染料,以避免对身体健康造成危害。
Scots became chemists in order that they might find better fertilisers , bleaches and dyes for their fabrics , and geologists as they sought to find their mineral wealth .