同时的英文短语有：

at the same time;

simultaneously;

concurrently;

in the meantime

同时，我的债务在不断增加。

Meanwhile, my debts were mounting up.

同时，在平底锅里将西红柿和油加热。

Meanwhile, heat the tomatoes and oil in a pan.

女性似乎比男性更擅长同时做数件事情。

Women seem to be able to multitask better than men.