HSK 7-9
Dǎ lánqiú shí zuìhǎo dài shàng hùxī, bǎohù guānjié.
It's best to wear knee pads when playing basketball to protect your joints.
HSK 7-9
Lǎorén de xīgài bùhǎo, yīshēng jiànyì tā shǐyòng hùxī.
The elderly woman had bad knees, and the doctor recommended she use a knee brace.
