这个电视节目每季都会换新的老师。

Zhè gè diànshì jiémù měi jì dōu huì huàn xīn de lǎoshī.

This TV program changes to a new teacher every season.

如果这季的销售不好，我们就要换新计划。

Rúguǒ zhè jì de xiāoshòu bù hǎo, wǒmen jiù yào huàn xīn jìhuà.

If this season’s sales are not good, we will have to change to a new plan.