自现象级英语
ONSET
1. 英英释义：the beginning of something, especially something bad
例句：Evidence shows that speaking a second language can help delay the onset of dementia.
2. 为什么选这个词？
“onset”是个名词，意思是“开始”，常常可以用来完美替换常见的“beginning”，是外刊中经常出现的表达。onset 表示“开始”时，后面常接有负向含义的名词，比如疾病、经济萧条、战争等。
比如战争开始后，犯罪率激增，就可以说成：
Since the onset of the war, the crime rate has skyrocketed.
有证据表明，会说一门外语有助于推迟老年性痴呆（dementia）。我们就可以用 onset 造句：
Evidence shows that speaking a second language can help delay the onset of dementia.
最近的《经济学人》中也出现了 onset：
The study adds substantial weight to the evidence linking cannabis to the onset of psychosis.（“the onset of psychosis”指“精神疾病的开端”，这句话是说研究表明吸食大麻很有可能导致患上精神疾病）
3. 怎样学会使用这个词？
1）翻译下面的句子：
经济危机爆发后，投资面貌发生了巨大变化。 (重点：爆发后 since the onset of, 投资面貌investment landscape，巨大变化 be changed tremendously )
The investment landscape has been changed tremendously since the onset of the financial crisis.
My version: In the wake of the financial crisis, the investment landscape has significantly transformed.
造句：
例1：The landscape of public health is likely to deteriorate at the onset of vector-born diseases such as malaria. 疟疾等虫媒病对公共健康的危害
例2：The onset of higher fuel costs is a clear indicator of growing traffic and pollution problem.改编自每周一段
例3：Evidence shows that blue economy and green economy can help delay the onset of global warming. 改编例句
个人拓展：
搭配：the onset of sth;
delay / mark / after/ since /at the onset
背诵：
onset, beginning
Evidence shows that speaking a second language can help delay the onset of dementia.
