at the same time; at once; simultaneously; concurrently
just as ...; the moment ...; just after ...
(but) at the same time; as well as; also; on the other hand
仕事と育児を同時にこなすのは大変だ。
It's tough to handle work and childcare at the same time.
ドアが開くと同時に猫が飛び出した。
The moment the door opened, the cat dashed out.
三つの問題を同時に解決する方法を探す。
I'm looking for a way to solve three problems simultaneously.