关于两个定语从句修饰一个名词,求专业老师回答

several times greater than 可以用, 这个文章 语法什么都对的 就是这一段有点便扭“ to say nothing of the side effects that extensive economy brings to our life,” 这个句子的语法不对.
虽然我不是专业老师可是
我从小就在外国长大. 应该会比专业英文老师好吧?
希望我的答案能帮你哦
(*^__^*) 嘻嘻
再问： 外国不学语法,只是语料熟悉度..所以你也不能指出哪里语法不对吧
再答： 我们是不学语法， 但是 句子开始的本来就不能用 to 然后再加上个 infinitive 啊。 但是有些 特殊情况 比如， to finish this you must complete this task .h　或什么的
再问： "to say nothing of "means "needless to say","even/much/still less","let alone"...etc.used after a statement to underscore that because the following next thing cannot be true or possible any more than the first thing.
再答： what in the world are you talking about about? ._. you just gave me quotes without any explainations O.O plus wtf is because the following next thing cannot be true anymore than the first thing ?!