precisely

1.exactly:通常有作比較的對象,比如：That,I think,was exactly his aim.我認為,這正是他的目的所在.

這裏就是與his aim進行對比.

又如：Exactly right.And that reason is gravity.完全正確.根本原因是地心引力.

這裏是與後面的And that reason is gravit進行比較的.

2.precisely：壹般作為精確的準確的講時用在測量的場合.

當做絲毫不差的,恰好的時,指的是恰逢其時機,沒有比較的意思.

比如：But that is precisely what is needed when there are so many alarming signs of overheating.不過,這恰恰是在種種警示經濟過熱的跡象浮現時極有必要潑的冷水.

3.accurately.意思比較單壹,主要指精確的,準確的.通常用在測量或者評估,但是準確程度要比precisely低.

比如：Individuals and corporations have strong economic incentives to accurately estimate the present and future earning capacity of the land.個人和公司都有強有力的經濟手段來確切估計現在和將來土地的盈利能力.