He usually talks in a high/low voice.
The TV's volume is too high/low.
You set the TV's volume too high/low.
Don't turn the air conditioner up too much/down too much.
The two books is 20 yuan 可以.也可以说：The two books cost20 yuan.
He usually talks in a high/low voice.
The TV's volume is too high/low.
You set the TV's volume too high/low.
Don't turn the air conditioner up too much/down too much.
The two books is 20 yuan 可以.也可以说：The two books cost20 yuan.