急求英语句子翻译！

One test of our data and procedures is to see how well the spot rates
extracted from coupon bond prices explain those prices. We do this by directly
comparing actual prices with the model prices derived by discounting
coupon and principal payments at the estimated spot rates. Model price and
actual price can differ because of errors in the actual price and because
bonds within the same rating class, as defined by a rating agency, are not
homogenous. We calculate model prices for each bond in each rating category
every month using the spot yield curves estimated for that rating class
in that month. For each month, average error ~error is measured as actual
minus model price! and the square root of the average squared error are
calculated. These are then averaged over the full 10 years and separately for
the first and last 5 years for each rating category.

我们的一项数据与程序检测工作，是通过将实际价格与模型价格（这种模型价格由按即期汇率折算的付息债券本息额决定）进行比较，来解释从付息债券价格中提取出的即期汇率是如何影响这些价格的。
模型价格和实际价格间的差异可由实际价格误差和同级债券在不同评级机构定义不同导致。
我们每个月对每种评级类别的每只债券，使用现货收益率曲线对该月该级别债券进行估算。
每月的平均误差为实际价格减模型价格，由此计算出标准差。然后对十年数据进行平均计算，再分别对前5年和后5年的数据进行平均计算。