As a safeguard against misuse, memorize your PIN number immediately and destroy this advice slip.为了防止别人盗用，立即记住你的个人密码，然后撕毁这张通知单。The department has just mailed out 300,000 notices.该部门刚刚邮寄出三十万份通知单。Ordinarily, we send a reminder about a month before payment is required.通常，我们会在要求付款的前一个月左右寄出一份通知单。