onset

['ɔnset]

n.攻击, 进攻, 开始

例句与用法：

A rare congenital disorder of childhood that is characterized by rapid onset of the physical changes typical of old age, usually resulting in death before the age of 20.

(儿童的)早衰症一种少见的少年身体机能失调，以类似年老的身体快速变化为特征，其结果通常导致二十岁之前死亡。

The attainment or onset of puberty.

到达青春期或青春期开始

He met many difficulties at the first onset.

在一开始时，他遇到了许多困难。

详细释义：

n.[theS][(+of)]

1. 开始

He went to see a doctor at the onset of a fever.

他开始发烧时便去看医生了。

2. 攻击, 袭击

Our troops withstood the onset of the enemy.

我们的部队抵挡住了敌人的进攻。