We should require a survey report, so that we may know the extent of the damage.
我们将要求出具检验报告,以便我们能了解损坏的程度。
If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
如果不是因为土壤下面有一层坚硬的岩石,他们的营救工作仅用几个小时就可以完成了。