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Be careful early on

In Omaha, even if you have the best hand before the flop or on the flop, you should play it very carefully as things can change fast.
With everyone having four hole cards there are so many extra possibilities, so even if you have the best hand you can be sure that someone is drawing to beat you.
In Pot Limit Omaha you don’t need to worry about building a pot.
The pots get big all by themselves.
You don’t want to build a big pot early on with the best hand only for the board to change and then face a big bet later on that you can’t call.

Then pounce on the turn
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这是对奥马哈新玩家的一些建议，根据后面的内容，前面的小标题：Be careful early on可能是什么意思呢？