onset

突然发作

Used to describe a condition or event that begins unexpectedly and quickly.

用于描述出乎意料且迅速开始的状况或事件。

迅速发作

Used to describe a condition or event that begins very quickly.

用于描述迅速开始的状况或事件。

早发

Refers to the beginning of a condition, especially a disease, at a younger age than is usual.

指某种状况（尤指疾病）在比通常更年轻的年龄开始。

晚发

Refers to the beginning of a condition, especially a disease, at an older age than is usual.

指某种状况（尤指疾病）在比通常更晚的年龄开始。

Refers to a beginning that happens later than expected.

缓慢发作

Used to describe a condition or event that begins gradually.

用于描述逐渐开始的状况或事件。

急性发作

Refers to a severe and sudden start, often in a medical context.

指严重而突然的开始，通常用于医疗领域。

在...发生时

Indicates the exact point in time when something begins.

表示某事开始的确切时间点。

在...发生之后

Indicates the period following the beginning of something.

表示某事开始后的时期。

在...发生之前

Indicates the period preceding the beginning of something.

表示某事开始前的时期。

自...发生以来

Indicates the entire period from the beginning of something up to the present.

表示从某事开始到现在的整个时期。

在...发生之前

A more formal way to indicate the period preceding the beginning of something.

一种更正式的方式，表示某事开始前的时期。

延迟...的发生

To make the beginning of something happen at a later time.

使某事的开始发生在更晚的时间。

预防...的发生

To stop something, especially a disease, from starting.

阻止某事（尤其是疾病）的开始。

标志着...的开始

To be a sign that something new is beginning.

作为新事物开始的标志。

预示着...的开始

To indicate or give a sign that something is about to begin.

指示或发出某事即将开始的信号。