他们在公园里练太极，一个小时都不停。

Tāmen zài gōngyuán lǐ liàn tàijí, yí gè xiǎoshí dōu bù tíng.

They practice tai chi in the park and don’t stop for a whole hour.

他正在练钢琴，别打扰他。

Tā zhèngzài liàn gāngqín, bié dǎrǎo tā.

He is practicing the piano; don’t disturb him.

如果你多练几次，就能记住这些生词。

Rúguǒ nǐ duō liàn jǐ cì, jiù néng jìzhù zhèxiē shēngcí.

If you practice a few more times, you’ll be able to remember these new words.