原级：PDA
1. It predicts sales of PDAs will continue shrinking in the first half of this year, but the decline might slow down in the second half.
2. Distributors'fretted interest in promotion had given way to PDAs'substitutes, which ate into PDA manufacturers's sales and profits.
3. More than 20 companies in China make PDAs, which are not compatible with each other.
4. Maybe it's just me, but I think PDAs should be left to other venues and not the movie theater.