What impressed him most was their speed.

最令他钦佩的是他们的速度。

I had always impressed upon the children that if they worked hard they would succeed in life.

我一直在使孩子们明白，生活中如果他们努力就会成功。

I've impressed upon them the need for more professionalism.

我已让他们认识到提高专业技能的重要性。

But this change has not yet impressed itself on the minds of the public.

但是这种变化仍没有使公众对此铭记在心。

It didn't impress me as a good place to live.

那地方没有给我留下适合居住的印象。