complication

n. /ˌkɑːmplɪˈkeɪʃn/ B2

使复杂化的问题；并发症

A thing that makes a situation more difficult or complex.

仙境例句

The Queen's letter brought one complication: who would hold the baby during croquet?

王后的信带来了一个难题：打槌球的时候，谁来抱婴儿呢？