Forex Mt In Forex, Why We Can Set Trailing Stop In Metatrader 4 Without The Stop Loss?

In Forex, why we can set trailing stop in Metatrader 4 without the stop loss? - forex mt

I am delighted with this odd, because once used FXCM platform before, and we need to establish SL first, before the TS. But in MT4, I TS mt without SL. Does anybody know why?

Thank you!