These hands are still strong, but they are vulnerable to the board pairing and draws. Suppose you have
And the flop comes r vv
If another queen hits, you have just about nothing (but can at least fold with a clear conscience). Therefore, it's all the more important that you get your bets in on the flop. Also, don't be so eager to re-raise a second or third time as you would with top two pair. In the situation above, you'd like to believe that nobody was playing Q7o, but in low-limit hold'em, your opponents will routinely show you that (and Q6o, too).
As we discussed before, you should normally be playing cards that are fairly close in rank. Thus, you won't be flopping top and bottom pair too often, with the occasional exception of AXs. When you flop two pair with that hand, play it fast. Many low-limit players will play any hand that contains an ace, and you could quite conceivably be up against the other two aces. If that's the case, you can make a lot of money, and you don't want to give them free cards with which to make a bigger two pair or pair the middle card on the flop. This also insures that you'll be charging the straight and flush draws as much as possible.
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