Lǎoshī tiěshēngshēng de yī zhāng liǎn, xià de xuéshēng bù gǎn táitóu.
The teacher's stern, iron face scared the students into keeping their heads down.
Tips
usage
Describes a face, manner, or attitude that is cold and unbending - iron-like. More about demeanor than content; you can be stern this way even when you're right.
