Nine people are practicing the triangle dance, which is a dance that requires a group of three people. During each round of practice, the nine people split off into three groups of three people each, and each group practices independently. Two rounds of practice are different if there exists some person who does not dance with the same pair in both rounds. How many different rounds of practice can take place?
1. First, we need to determine the number of ways to split 9 people into three groups of three. We start by choosing the first group of 3 people from the 9 people. This can be done in $\binom{9}{3}$ ways.
   \[
   \binom{9}{3} = \frac{9!}{3!(9-3)!} = \frac{9!}{3!6!} = \frac{9 \times 8 \times 7}{3 \times 2 \times 1} = 84
   \]

2. Next, we choose the second group of 3 people from the remaining 6 people. This can be done in $\binom{6}{3}$ ways.
   \[
   \binom{6}{3} = \frac{6!}{3!(6-3)!} = \frac{6!}{3!3!} = \frac{6 \times 5 \times 4}{3 \times 2 \times 1} = 20
   \]

3. The last group of 3 people is automatically determined, and there is only 1 way to choose them:
   \[
   \binom{3}{3} = 1
   \]

4. Since the order in which we choose the groups does not matter, we must divide by the number of ways to arrange the 3 groups, which is $3! = 6$.
   \[
   \text{Total number of ways} = \frac{\binom{9}{3} \cdot \binom{6}{3} \cdot \binom{3}{3}}{3!} = \frac{84 \cdot 20 \cdot 1}{6} = \frac{1680}{6} = 280
   \]

Conclusion:
\[
\boxed{280}
\]