Sputum is a liquid substance from the mouth.

唾液是口腔中分泌的液体。

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These microplastics included a substance commonly known as PET and widely used in the manufacture of clothing and food and liquid containers.

这些塑料微粒包括一种通常被称为 PET 的物质，广泛用于服装、食品和液体容器的制造。

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However, by using an oily liquid and an aqueous one, and by covering one side of the channel with a substance that repels water and the other side with one that attracts water, this can be avoided.

但是，利用一种油性液体和水，以及在通道的一面覆盖上一层疏水物质，另一面覆盖上吸水物质，既可避免这一情况。

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James Baker 's University of Michigan spinoff NanoBio created a white, creamy liquid substance called NanoProtect.

FORBES: Nanotech On The Front Lines

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

However, by making something out of ions that are bulky and asymmetrical (they have names such as 1-butyl-3-methylimidazolium and hexafluorophosphate, which are as complicated as the ions they represent), the attractive electrical forces can be kept so far apart that the resulting substance is a liquid at room temperature.

ECONOMIST: Ionic solvent