us500, -5.99%, +10d

多方抵抗，用時間抵抗下跌，無報酬但是有風險，空方回補週期10天 ，-9.51% ~ -5.99%。

time to instead of drop down, no reward but has risk, short to cover time for 10 trading day, -9.51% to -5.99%