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请教下,这段要怎么翻译if后面那一串看不懂
if (ref(S1,1) > n1 and holding <=0 and time > stime and time < etime) thenbegin sellshort(1,abs(holding),nextopen) ; //平空仓buy(1,1,nextopen) ;//开多仓DRAWNUMBER(1,H+2,NEXTOPEN,0);end