Language Point 18

...all surgical instruments and materials were accounted for...(Para. 4)

account for: 1. give a statement about something

You'll have to account for where every penny goes.

你得说清楚每一分钱都用到哪里去了。

You have to account to the Head Office for any stamps you use.

你得向总部说明那些邮票的用处。

2. be or give a reason for (something or doing something)

He could not account for his foolish mistake.

他无法解释自己犯的愚蠢错误。

How do you account for losing such a large sum of money?

你丢了这么多钱，怎么解释呢？