She was very collected and sure of herself.

问题描述:

She was very collected and sure of herself.

她非常镇静并相当自信。

她非常镇静并相当自信。
be sure of 对...确信
Do you understand?

她对自己很自信/

她非常泰然自若,并且很自信。

她非常镇静并相当自信