[amibroker] Help please

[mravie7]

Buy=EMA(C,13)>EMA(EMA(C,13),9) AND Cross (C,Peak(C,5,1)); 
Sell=Cross (EMA(EMA(C,13),9),EMA(C,13)); 

Hi,
Can someone please explain this in plain English, what the above 
formula means.

Cheers
Ravi