complex soap grease

例句：

1. 1.The problem is complex and requires a thorough understanding of the underlying principles.
   这个问题很复杂，需要对基本原理有深入的理解。
2. 2. The architecture of this building is complex, with many different materials used.
   这座建筑的构造复杂，使用了多种不同的材料。
3. 3. The complexity of the software required extensive testing to ensure it worked as expected.
   软件的复杂性要求进行了广泛的测试，以确保它按预期工作。