This product is white powder, not dissolved in water.

本品呈白色粉末，不溶于水。

youdao

This product is very fine white powder, not dissolved in water.

本品为极细白色粉末，不溶于水。

youdao

Appearance: black powder, odorless, tasteless, not dissolved in general, solvents.

外观：为黑色粉末，无臭，无味，在一般溶媒中均不溶解。

youdao

But he said someone had to make clear to anti-slavery Democrats that the union would be dissolved if the constitutional rights of slave owners were not honored.

VOA: special.2009.07.09

Here, there are receptors on one cell and the ligand that they experience is not a dissolved molecule, but actually a molecule that's attached to another cell.

这个细胞上有许多受体,与之结合的配体并非是可溶性分子,而是一个附着在其他细胞上的分子

耶鲁公开课 - 生物医学工程探索课程节选

Like other iron minerals, green rust readily absorbs dissolved elements onto its surface, but green rust is not only particularly efficient at this in many cases, it can also react with toxic dissolved trace metals to make them insoluble, and as a result, renders them in nontoxic forms.

MSN: What green rust did long ago to the big blue ocean

The team found that most of the methane is being dissolved into the seawater and did not detect evidence of the gas breaking the surface of the ocean and getting into the atmosphere.

BBC: Methane seeps from Arctic sea-bed

Had it not managed to agree to keep talking, the assembly would have dissolved in wretched failure.

ECONOMIST: Parliament dithers on