reckoning

估算，估计英释中释ncalculation that is based on a careful guess rather than on exact knowledge

1 day of reckoning,n. 结账日；最后审判日

2 dead reckoning,n. 航位推测法

1 By my reckoning, we have 12,000 clients..据我估计，我们有1.2万名客户。