perplexing
adj. 复杂的，令人费解的；令人困惑的
例句
The Earth-Moon system has always been perplexing.
地月系统一直令人困惑。
Equally perplexing constituents of Allende are the refractory inclusions: irregular white masses that tend to be larger than chondrules.
阿连德陨石中同样令人困惑的成分是那些耐高温的内部物质：往往比陨石球粒要大的不规则白色块状物。
It took years to understand many perplexing diseases.
许多疑难病症要耗时多年才能搞明白。
《柯林斯英汉双解大词典》
