Source: Mr Bridge On -Line

Often the best way to play a suit is not to play it yourself but to let the other side lead it. With A-J-x facing K- 10-x you have a two-way guess – but not if the opponents lead it. If you play on a suit like Q-x-x facing J-x-x, you will need to find a helpful layout, such as the A-K in one hand for you to set up a trick. However, you are sure of a
trick if the opponents lead it. Likewise, if you have an A-Q holding, you are sure of a second trick if LHO leads the suit. Of course, defenders are wise to this. They lead these suits only when you have taken away their other options.

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