家长需要适度干预孩子的学习。

Jiāzhǎng xūyào shìdù gānyù háizi de xuéxí.

Parents need to intervene moderately in their children's learning.

有些问题需要政府适当干预，市场才能健康发展。

Yǒuxiē wèntí xūyào zhèngfǔ shìdàng gānyù, shìchǎng cái néng jiànkāng fāzhǎn.

Some issues require appropriate government intervention for the market to develop healthily.

老师只在必要的时候才会干预同学之间的矛盾。

Lǎoshī zhǐ zài bìyào de shíhou cái huì gānyù tóngxué zhījiān de máodùn.

The teacher only intervenes in conflicts between students when it is necessary.