seems the NASDAQ goes in this way since it drops from 2150.
1. go down, support at SMA50, rebounce
2. go down again, break SMA50, support at SMA100, rebounce but SMA 50 becomes resistance.
3. go down again from SMA 50, break SMA100, get support at SMA150, rebounce.
if the history repeats, the SMA100 will be the resistance this time,
and unfortunately SMA100 equals 2000 now, very difficult to break out 2000.