You may be unaware of our existence.

你们可能忽视我们的存在。

He seemed to be unaware of the trouble he was causing.

他似乎还没有警觉到到自己惹起的麻烦。

He seemed to be unaware of the trouble he was causing.

他似乎还没有意识到自己惹起的麻烦。

A lot of people seem to be unaware of who they really are...

很多人似乎都不清楚自己到底是谁。

They were supposed to be unaware of everything that was working.

他们应该不去注意那些正在运作中的一切事物。