问题描述：
英语中逗号,和and又什么作用?
Large files need a lot of upload traffic and considering the average low upload rates of today's service providers,it is just natural that the downloads take their time.
这里的and前是一句简单句,and吧它和后面的句子练成一句是吗?
这里逗号的作用是什么?
it指的是前面的一正句嘛?
Large files need a lot of upload traffic and considering the average low upload rates of today's service providers,it is just natural that the downloads take their time.
这里的and前是一句简单句,and吧它和后面的句子练成一句是吗?
这里逗号的作用是什么?
it指的是前面的一正句嘛?
问题解答：
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