记忆方法
联想：啊,你竟然敢单脚拉屎，在下佩服佩服，这么危险的动作你都能搞出来，实在佩服。
danger为何是危险，请参考如下词源：
来自法语，来自拉丁语dominus：统治，主人（其他同根词如：domain领域，范围；dominant占优势的，统治的，支配的），原指君主的权力，君主的威严，引申义危险。所谓伴君如伴虎就是这么来的，随时有生命危险啊。大家可以看到其实任何人类文明的起源都有相似性。不只是中国古代帝王难陪伴，国外的一样的。
双解例句
小知识
Use the word dangerous to describe anything that can potentially cause serious harm, like a snarling pit bull or an icy, treacherous road.
The earliest meaning of the word dangerous was “difficult or arrogant.” When Geoffrey Chaucer wrote “The Canterbury Tales” in the 1300s, he used dangerous to mean “hard to please.” Gradually the meaning changed, so that by the late fifteenth century, dangerous meant “liable to cause hurt” or “risky.” Just as popular were two other danger-related words that we don't use anymore today: dangersome and dangerful, which at the time could be used interchangeably with dangerous.
实用短语
常用短语
单词用法
dangerous与in danger的区别在于：
dangerous表示能够或可能造成危险的，指主体对外界有危害，而本身却未必有危险，
in danger则是“(主体本身)处于危险状况”或“在危险中”的意思。
例如：
The patient is in danger,he may die at any time
那位病人很危险，随时可能死亡。
The man is dangerous,he may kill any-body
那人很危险，他有可能杀人。
dangerous situation 危险的处境
dangerous driving 危险驾驶
dangerous waters 危险水域
词根词缀
后缀: -ous
表形容词,通常放在一个完整的单词后面,表示”……的”
adj.
rigorous 严格的,严厉的,严酷的,严密的,严谨的rigor严格,严厉,苛刻,严密+ous……的→adj.严格的,严厉的,严酷的,严密的,严谨的
advantageous 有利的,有助的advantage优势,有利条件,利益+ous……的→adj.有利的,有助的
courageous 勇敢的,无畏的courage勇气,精神+ous……的→adj.勇敢的,无畏的
dangerous 危险的,不安全的danger危险,危险物,威胁+ous……的→adj.危险的,不安全的
poisonous 有毒的,恶意的,恶毒的,道德败坏的poison毒药+ous……的→adj.有毒的,恶意的,恶毒的,道德败坏的
同义词
unsafe / violent / hazardous / deadly / adventurous / headlong / despairing / perilous / alarming / forbidding / risky / slippery / chancy / explosive