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然而，能在头脑中快速进行数字运算，能做出粗略但相当正确的估计，能理解诸如复利和基本统计之类的事情，会让你比许多人领先一大步。
本句的主干是...the ability...gives you a...lead。其中，三个to引导的并列不定式短语作ability的定语。
My hands were rough with hard work.
我的双手因繁重的工作而变得粗糙。
We must make sure that the information is accurate.
我们必须确保情报是准确的。
give sb.a big lead on意为"使某人比……领先一大步"，要表示"某人领先一大步"则可以说have/take a big lead。如：
I guessed that he would be the winner because he had a big lead.
我猜他会获胜，因为他现在遥遥领先。
accurate、exact、precise、right、true和correct这几个形容词均含有"准确的，正确的"之意，但它们在意义或用法上稍有区别。
accurate指与事实相符、无误，即使不是精确对应，偏差也不太大。如：
Anna is always accurate in punctuation and spelling.
安娜的标点和拼写总是非常精确。
The exact date of my grandfather's birth is not known.
我爷爷出生的确切日期无人知道。
As well as being precise，the report being delivered was impersonal.
这份稿子不但用词确切，而且不带个人色彩。
It is right to send him the message.
给他发消息是正确的。
I'm afraid that your commentary on this issue is not correct.
恐怕你对达个问题的评论是不正确的。
