尼赛村乘坐缆车:谁知道在FLASH里这是什么意思

ac=1.5;
de=2.5;
space=12;
for(n=7;n>=0;n--){
set("/trace"+n+".x",getProperty("/trace"+n,_x));
set("/trace"+n+".y",getProperty("/trace"+n,_y));
set("/trace"+n+".vx",0);
set("/trace"+n+".vy",0);
}
startDrag("/trace0",true);

for (n=1;n<=7;n++){
set("/trace"+n+".vx",(eval("/trace"+n+".vx")+(eval("/trace"+(n-1)+".x")+space-eval("/trace"+n+".x"))/ac)/de);
set("/trace"+n+".vy",(eval("/trace"+n+".vy")+(eval("/trace"+(n-1)+".y")-eval("/trace"+n+".y"))/ac)/de);
set("/trace"+n+".x",eval("/trace"+n+".x")+eval("/trace"+n+".vx"));
set("/trace"+n+".y",eval("/trace"+n+".y")+eval("/trace"+n+".vy"));
}
set("/trace0.x",getProperty("/trace0",_x));
set("/trace0.y",getProperty("/trace0",_y));
for(n=1;n<=7;n++){
setProperty("/trace"+n,_x,eval("/trace"+n+".x"));
setProperty("/trace"+n,_y,eval("/trace"+n+".y"));
}

gotoAndPlay(2);

这三个脚本的意思