The concept of the lasing lifetime of working substance in the solid dye laser is promoted to liquid dye laser, and a twin laser beam testing method to measure the lasing lifetime is presented.

把固体染料激光器工作介质激射寿命的概念推广到液体染料激光器中，同时提出了一种针对液体激光染料激射寿命的双激光光路测试方法。

youdao

The properties of working substance in liquid Stirling engine is discussed in this paper.

介绍了液相斯特林机用液相工质的性质。

youdao

They are working with the Farmwatch scheme in the Test Valley to introduce a liquid substance which can be added to fuel to "chemically tag" it.

BBC: Heating oil 'tagged' to tackle rural theft in Hampshire