This leaves the employer, at least theoretically, in the very strong position of being able, without having to prove any default on the part of the contractor, to call down a large sum of money which will be debited to the contractor.
这样雇主至少在理论上处于相当有利的地位，在无需证明承包人违约的情况下，就可能收兑一大笔资金，而这笔帐将计入承包人的贷方。