这种物质的反应速度是另外那个物质的3倍。
This substance reacts is three times as fast as the other one.
This substance reacts is three times faster than the other one.
哪句更对,请老师帮解答.特别是比较级的翻译,我们很头痛,请老师一并讲解

个人认为第1句是对的，请老师指正

怎么没有老师帮我解答呢？好急呀！！！！

我觉得第一句比较靠谱

这是倍数问题。第一句对。骑士老师有道每日一练题。我仔细学习过。
但不知正确否，请骑士老师抽空回答一下。谢谢！

问题是要搞清楚错为哪，为什么错，这才是关键的问题呀

首先，很抱歉这么晚才回复你。前两天休息。
这种物质的反应速度是另外那个物质的3倍。以下两种说法都对。
This substance reacts is three times as fast as the other one.
This substance reacts is three times faster than the other one.
解析：考察倍数的表达方式。现在把最基本的倍数的表达方式归纳如下：
1. ..times as +形容词原级+as，如：
  The table is four times as big as that one.
2. ..times +形容词比较级+than，如：
  The table is three times bigger than that one.
3. ..times +the +性质名词+of，如：
  The table is three times the size of that one.

我们这里有个英语老师说是第一句更,第二句表达的是4倍的意思,对于比较级的表达真的很是搞不清的..

1. ..times as +形容词原级+as，如：
  The table is four times as big as that one.
2. ..times +形容词比较级+than，如：
  The table is three times bigger than that one.
3. ..times +the +性质名词+of，如：
  The table is three times the size of that one.
老师你上述举例都是表达的同一个意思吗:这张桌子是那张的三倍?
请老师明示/.....如果是同一个意思,那么,This substance reacts is three times as fast as the other one.和This substance reacts is three times faster than the other one.就不是同一个意思了

我没仔细看汉语原文。应该是第一句是对的。第二句表达的是4倍的意思。
现重新归纳如下：
如表达“这张桌子是那张桌子的四倍”：
1. ..times as +形容词原级+as，如：
  The table is four times as big as that one.
2. ..times +形容词比较级+than，如：
  The table is three times bigger than that one.
3. ..times +the +性质名词+of，如：
  The table is four times the size of that one.