3 sentences

1. 忠诚必须是双向的。

   zhōng​chéng bì​xū shì shuāng​xiàng de.

   Loyalty has to work both ways.

   Source: OpenSubtitles

2. 这种教学方式鼓励师生之间的双向互动。

   zhè zhǒng jiào​xué fāng​shì gǔ​lì shī​shēng zhī​jiān de shuāng​xiàng hù​dòng.

   This teaching method encourages two-way interaction between teachers and students.

   Source: Dong Chinese Dictionary

3. 这条双向车道可以有效缓解交通压力。

   zhè tiáo shuāng​xiàng chē​dào kě​yǐ yǒu​xiào huǎn​jiě jiāo​tōng yā​lì.

   This two-way lane can effectively relieve traffic pressure.

   Source: Dong Chinese Dictionary