疾病的早期症状在发病初期就出现了。

The early symptoms appeared at the ___onset of the disease.

流感症状的初期通常会伴随高烧和乏力。

Fever and fatigue usually mark the ___onset of flu symptoms.

在单词'splash'中，'spl'构成了音节的起始辅音组合。

The word 'splash' has a consonant cluster '___onset' of 'spl'.