同时(tóng shí) - at the same time, meanwhile, simultaneously in Mandarin

他tā们men同tóng时shí到dào达dá了le。

They arrived at the same time.

我wǒ不bù能néng同tóng时shí做zuò两liǎng件jiàn事shì。

I cannot do two things at once.

同tóng时shí，我wǒ们men也yě要yào小xiǎo心xīn。

At the same time, we must also be careful.

他tā同tóng时shí学xué习xí两liǎng门mén语yǔ言yán。

He studies two languages simultaneously.

这zhè件jiàn事shì有yǒu好hǎo处chù，同tóng时shí也yě有yǒu风fēng险xiǎn。

This has benefits, and at the same time risks.