四重的

A quartet is playing tonight.

今天晚上有一个四重唱表小组。

Can say, defend quadruply set out completely from the point of view that protects player interest, arrive from Zhang name code resist trojan virus, to the player overall safety assures.

可以说，四重防护完全从保护玩家利益角度发，从账号密到抵御木马病毒，给玩家全面安全保证。