“粗略的”的英语？

我们从几方面粗略的说法中设法弄清了真相.We managed to piece together the truth from several sketchy accounts.很明显那是个粗略的估计，但我猜会有一笔不少的余额。Clearly that's an approximation, but my guess is there'll be a reasonable balance.上述估算结果只能是粗略的近似...