其实让步和转折都有一种“对比”的含义，英语称之为"contrast"。而让步和转折就是在"contrast"下的两个子分类。1. 连接副词和词组(transition words and phrases)：however；nevertheless；nonetheless；still。例句：Millions of people go on diets ever year; however/nevertheless/nonetheless/still, very few succeed in losing weight。2. 从属连词(subordinatiors)：although；even though；though。这三个词意思几乎一样，though相对没那么正式，even though语气稍强烈于although。例句：Although/Even though/Though most dieters initially lose a few pounds, most gain them back again within a few weeks。注：一些作者会遵循正式的逗号规则——只有当让步从句出现在主句之前，才使用逗号，但另一些作者无论主句和从句的顺序是什么，都会在它们之间使用逗号。3. 其他词组：despite/in spite of + n。例句：Despite/In spite of 10 years of dieting, I am still fat。
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