cautious的名词形式为caution。cautious作为形容词，含义为“小心的”、“谨慎的”；而caution除了作为名词之外，还可作动词，基本含义为“小心”、“慎重”、“提醒”、“警告”、“告诫”。
一、cautious的含义及用法
cautious作为形容词，意为小心的;谨慎的。
例句：They've taken a very cautious approach .
他们采取了十分谨慎的态度。
The scientists are cautious about using enzyme therapy on humans...
科学家们对在人身上使用酶疗法非常慎重。
The government has been cautious in its response to the report.
政府对此报道反应谨慎。
He was very cautious about committing himself to anything.
他谨小慎微，从不轻易表态。
Australia, put in to bat, made a cautious start.
轮到澳大利亚队出场击球，他们开始打得很谨慎。
二、caution的含义及用法
1、作为名词时，意为小心;谨慎;慎重;(警察向犯轻罪的人发出的)警告;(对危险或风险的)警告，告诫。
例句：Statistics should be treated with caution .
对待统计数字要慎重。
As a first offender, she got off with a caution.
她由于是初犯，被从轻发落，只受到了警告。
Some cautions must be mentioned─for example good tools are essential to do the job well.
有些警告一定得说，如：工欲善其事，必先利其器。
2、作为动词时，意为警告;提醒;告诫;提醒(某人说的任何话都可能在法庭上被当作对其不利的证据);警告(某人不得再做错事或非法的事)。
例句：I would caution against getting too involved.
我要提出警告，别介入得太深。
Suspects must be cautioned before any questions are asked.
嫌疑犯在回答问题前必须得到提醒。
She wasn't sent to the juvenile court; instead she was cautioned.
她未被送上少年法庭，而是受到了警告。
