unused balance

例句：

1. 1.The company has a large unused balance in its bank account.
   该公司银行账户中有大量的未使用余额。
2. 2.The unused balance is due to the company's slow cash flow.
   未使用的余额是由于公司的现金流缓慢造成的。
3. 3. The unused balance needs to be reconciled with the bank before the end of the month.
   月末之前需要将未使用的余额与银行对账。