请翻译下答案，看不懂哦

问题如下：

What problems are encountered when using comparable publicly traded companies to value private acquisition targets?

解释：

There are many complexities in using comparable companies to value private targets, including the following:

• The lack of public comparison companies operating in the same business, facing the same risks, and at the same stage of development. It is often possible to identify "approximate" comparisons but very rare to find an exact match. It is essential, therefore, to use judgment when using comparison company information, rather than just taking the average multiples derived from a sample of disparate companies.

• Comparison companies may have different capital structures, so estimated beta coefficients and some financial ratios should be adjusted accordingly.

• Reported accounting numbers for earnings must be chosen carefully and adjusted for any exceptional items, atypical revenues, and costs in the reference year. Care must also be taken to decide which earnings figures to compare—the main choices are trailing earnings (the last 12 months), earnings from the last audited accounts, or prospective year-ahead earnings.