beconcernedwith和about的區別

例句：

The soldiers concerned were unarmed at the time.

有關士兵當時未攜帶武器。

He knew her weak spot where Steve was concerned.

他了解她在與史蒂夫有關事情方面的`缺點。

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

對她的安全他似乎一點都不擔心。