OFF表示降价的问题The sweater is 30% off.This kind of lipsticks is a

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OFF表示降价的问题
The sweater is 30% off.
This kind of lipsticks is at 50% off the regular prices.
这两个句子都是教参书上给的答案,为什么一个有at,一个没有at?
这跟降价到50% 和降价30%
基本明白大家的意思了,但是如果都是打七折,两句的数字都是30%,还是第一句是30%,第二句是70%呢

我们一般说打折是不用at的,直接就是30% off,表示7折.
第二句之所以有at,并不是说at修饰50% off,而是修饰后面的regular price,这里的介词你可以理解为at the regular prices,基于平时的价格打了对折,基于、在原有价格的基础上.如果没有这个regular prices,这句话就不需要at了.
补充问题的回答：7折两句都是30% off,7折价格就是原有价格少了30%,英语讲法比较跟数学算起来吻合.6折就是少了40%,40% off~这个是固定的说法,跟你后面是不是有at the regular prices没有关系的.恰恰有了at the regular prices,就说明了是原来价格上少了30%,打了7折.比较拗口,

this is just off the top of my head now The UK is off the northwest coast of Europe.off此处表示远离, This is no time to engage in the luxury of cooling off 里面的in There is another kind of mail taking off in china .is off the coast of Australia. The gas is off 'Nothing is off the “lay off is a better off”, This is no time to engage in the luxury of cooling off or This is the ----we put off the meeting(ressonable) is a long way off的意思 The film is（）this afternoon.on in off选择!