At that time, the general public was/ were not aware of the health risks.
那時，公眾對各種危及健康的`因素尚不瞭解。
She was aware that she was losing all sense of perspective.
她意識到自己正在失掉一切正確判斷的能力。
I'm aware of Mark's reputation for being late.
我知道馬克遲到是出了名的。
Were you at any time aware of a quarrel between the two of them?
你什麼時候注意到他倆拌過嘴嗎？
She slipped away without him being aware of it.
她悄悄離開，沒有讓他發覺。