unused portion of letter of credit

例句：

1. 1. The company plansto refurbish the old building and convert it into a new office space.
   公司计划翻新这座旧楼，将其改造成新的办公空间。
2. 2. The architect designed a unique structure that utilizes unused space efficiently.
   建筑师设计了一个独特的结构，有效地利用了未使用的空间。
3. 3. The unused portion of the project has been identified and will be addressed in the next phase of work.
   项目未使用的部分已经被识别出来，并将在下一阶段的工作中得到解决。