Zhè shì yī tiáo dānxiàng xíngshǐ de jiēdào.
This is a one-way street.
Tāmen zhījiān de gōutōng shì dānxiàng de, tā cóng bù huíyìng.
The communication between them is one-sided — she never responds.
Dānxiàng jìng cóng wàimiàn kàn xiàng pǔtōng bōlí.
A one-way mirror looks like ordinary glass from the outside.
