At that time, the general public was/ were not aware of the health risks.
那时，公众对各种危及健康的`因素尚不了解。
She was aware that she was losing all sense of perspective.
她意识到自己正在失掉一切正确判断的能力。
I'm aware of Mark's reputation for being late.
我知道马克迟到是出了名的。
Were you at any time aware of a quarrel between the two of them?
你什么时候注意到他俩拌过嘴吗？
She slipped away without him being aware of it.
她悄悄离开，没有让他发觉。