I have been to Zhangjiakou.

We will never know if he told the truth, because dead men tell no tales.

His words reminded me of the proverb 'good advice may be uncomfortable to hear.'

The urban legend of the slit-mouthed woman terrifies children.

By training the orbicularis oris muscle, your expressions become more expressive.

He quoted the proverb 'Once a word leaves your mouth, you cannot chase it back even with the swiftest horse' to teach me to choose my words carefully.

I use plain flour to make bread.

He proposed a new theory about quantum mechanics.

Thanks to his serendipity, we were able to find a new business opportunity.

Intermolecular forces are an important factor in determining the properties of a substance.