I would know
I may be one of the first players to take the charge in playing Dota in their 30’s, but I do hope many more will follow in my footsteps because I truly believe it is good for the game and esports as a whole. It is important to not feel limited or pressured by a fictional age range that people made up and have no idea what they are talking about. I would know. I have been playing this game professionally longer than just about anyone.如果说这句话是要表示 “我在这个行业呆得够久, 所以我是了解这些事情的”，为什么要用 would know， 不用 know 或者 knew 呢？ 因为最后那句。
反过来同样成立：
A:你知道长江里有多少种鱼吗？
B:我上哪知道去…（我怎么知道…）（我又不是鱼类专家 I wouldn't know.
“我玩这个游戏比任何人都多” 所以 “我当然知道啊” I would know.
原来是这样啊， 感谢回复
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