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.
你得說清楚每一分錢都用到哪里去了。
You have to account to the Head Office for any stamps you use.
你得向總部說明那些郵票的用處。
2. be or give a reason for (something or doing something)
He could not account for his foolish mistake.
他無法解釋自己犯的愚蠢錯誤。
How do you account for losing such a large sum of money?
你丟了這么多錢,怎么解釋呢?