complex infection的用法和樣例：
例句
- The disease was caused by the mixed infection of Fusarium solani and plant nematodes.
該病的發生是由於腐皮鐮刀菌與植物線蟲複合感染所致。 - Three major symptom types, i.e. symptomless virus infection, irregular yellow spot and severe yellow mosaic were evidenced in the field.
以電顯觀察茉莉花病葉粗汁液，發現其內至少含有三種長度不一絲狀粒子的病毒病原，乃一複合感染之病害。
