Like this:
....
    server {
        listen       80;
        server_name  10.66.23.98 boy.zeuscn.com;
        #charset koi8-r;
        #access_log  /var/log/nginx-access.log;
        access_log off
        root /usr/www/webroot;
        index  index.php index.html index.htm;
..........
nginx syntax check pass OK.