Definition: when something is complex Level: C2
我们遇到了一个极其复杂的问题。
We faced a problem of great ___complexity.
这个系统可能会因其自身的复杂性而崩溃。
The system may collapse under its own ___complexity.
理解量子力学的复杂性需要高级数学知识。
Understanding the ___complexity of quantum mechanics requires advanced mathematical knowledge.
