beconcernedwith和about的区别

例句：

The soldiers concerned were unarmed at the time.

有关士兵当时未携带武器。

He knew her weak spot where Steve was concerned.

他了解她在与史蒂夫有关事情方面的`缺点。

He didn't seem in the least concerned for her safety.

对她的安全他似乎一点都不担心。