at the same time

Prepositional phrase

Simultaneously. / On the other hand (introducing an opposing viewpoint).

Japanese Meaning

同時に、同時発生で / 一方で、それに対して

She juggled answering emails and preparing the presentation at the same time.

彼女はメールの返信とプレゼンテーションの準備を同時にこなした。

Sense（1）

Simultaneously.

I bid him come towards me and give me his letter, at the same time throwing down, carelessly, a book I had in my hands.

Sense（2）

On the other hand (introducing an opposing viewpoint).