这杯咖啡好像掺了太多水，味道很淡。

Zhè bēi kāfēi hǎoxiàng chān le tài duō shuǐ, wèidao hěn dàn.

This cup of coffee seems to have too much water mixed in; it tastes very weak.

别在果汁里掺其他东西，我喜欢纯的。

Bié zài guǒzhī lǐ chān qítā dōngxi, wǒ xǐhuan chún de.

Don't mix anything else into the juice; I like it pure.

他在水泥里掺了些沙子来降低成本。

Tā zài shuǐní lǐ chān le xiē shāzi lái jiàngdī chéngběn.

He mixed some sand into the cement to reduce costs.