回复：没有没有，我们讨论的真正重心是逻辑，和这些其实不太相干

Learn some basic rules of logic. No additional evidence is required for a flawless logic flow. Evidence is only necessary when there is a missing or a weak link in the logic flow.

For example:
Logic flow A) If it is true that all people in this forum can use computer, then NewCommer can use computer because NewCommer is in this forum. THis is a flawless flow no additional evidence is needed.

Logic flow B) If all people in this forum can use computer, then NewCommer can use computer because NewCommer is in WenXuecheng. This is a flow with a missing link, because in WenXueCheng does not necessary means in this forum. You need evidence showing NC is not only in WXC but also in this forum to make this flow flawless.

Do you see missing-link or weak-link in the logic flows I provided? or Give me a logic flow with flaw that you think is mine and tell we at which point evidence is needed.