老师用眼神示意我们安静下来。

Lǎoshī yòng yǎnshén shìyì wǒmen ānjìng xiàlai.

The teacher signaled us to quiet down with her eyes.

他轻轻举起手示意司机停车。

Tā qīngqīng jǔqǐ shǒu shìyì sījī tíngchē.

He gently raised his hand to signal the driver to stop.

他向我点点头，示意可以开始了。

Tā xiàng wǒ diǎndiǎn tóu, shìyì kěyǐ kāishǐ le.

He nodded to me, indicating that we could start.