糖很容易在热水中溶解，所以你多搅拌几下就行了。

Táng hěn róngyì zài rèshuǐ zhōng róngjiě, suǒyǐ nǐ duō jiǎobàn jǐ xià jiù xíng le.

Sugar dissolves easily in hot water, so just stir it a few more times.

这种化学物质在冷水中几乎不溶解。

Zhè zhǒng huàxué wùzhì zài lěngshuǐ zhōng jīhū bù róngjiě.

This chemical substance hardly dissolves in cold water.

老师用实验演示了盐在水中的溶解过程。

Lǎoshī yòng shíyàn yǎnshì le yán zài shuǐ zhōng de róngjiě guòchéng.

The teacher used an experiment to demonstrate the process of salt dissolving in water.