Back in this time period accounting records were handwritten, red ink indicating a loss, and black ink a profit.

在之前这段时期，会计记录都是用手写的，红字代表亏损，黑字代表盈利。

" To go over the books" (books) means to review the accounting records and financial statements for a business.

“翻阅账簿”（books）是指审查企业的会计记录和财务报表。

So, " auditing the books" means looking at your company's accounting and financial records to make sure everything is correct.

因此，“审计账簿” 意味着查看贵公司的会计和财务记录以确保一切正确。

The " books, " here, refer to the accounting records, a list of how much you spent and how much income you made – how much money you received.

这里的“账簿” 指的是会计记录，是你花了多少钱和赚了多少钱——你收到了多少钱的清单。