The difference between the slowest and fastest profiles is 7 points.

呵呵，别小看这一句话，要准确地翻译出来还是挺有难度的，尤其离不开对上下文的理解。最先给出正确答案（或最接近正确答案）的奖励18分，另选两个最积极谈论问题的每人奖励10分。请大家凭自己的力量翻译，使用翻译软件或单纯引用别人的回复都视为灌水，删帖并扣除积分和声望。

上下文：
The dissolution profiles obtained with each of these media are illustrated on Table 15a. The quantities of active ingredient released at time points 1 and 8 hours are virtuaaly identical whatever the nature or pH of the medium. The percentages are slightly more varied at 4 hours. However, the profiled obtained with the pH 4.5, 6.9 and 7.2 media are similar, and the difference between the slowest and fastest profiles is 7 points. The profile obtained with the pH 1.5 medium is slightly more rapid than the others. However, the results as a whole confirm the low pH-dependence of the Aquacoat film. The dissolution rate appears to be more dependent on the nature of the medium than on its pH value. This disadvantage of the previously buffered media is that they accelerate the dissolution rate: more than 70% of the active ingredient is released after 4 hours. This could result in poor reproducibility of the dissolution test. We have therefore chosen to use purified water as the dissolution medium.
Table 15a
Time    pH1.5  pH4.5    pH6.9  pH7.2
1 hour  38.4%  34.3%    33.9%  36.7%
4 hour  82.6%  74.2%    71.3%  78.2%
8 hour  92.1%  87.5%    87.1%  92.9%

背景知识：缓控释药物需考察药物在不同时间点的释放度。本段文字讲的是释放度检验方法的方法学验证，目的是考察不同pH的释放介质对药物释放的影响。



本来这个7 points是很难理解的，但只要看清了上下文和表格中的数据就很好理解了。它是指百分比，而不是有些网友理解的7个小时。另外有网友把profile理解成特征，其实它在这里是指药物的释放行为，即释放曲线。atalas最先给出最接近原意的答案，后面的人基本上是讨论和补充，所以给atalas奖励18分。rogerhuang009和flyrose1978最积极，每人奖励10分。其他参与讨论的人给予精华。