“试用期” Free Trial Period（注册第1天到30天 及 还有试用金）
You have $XXX.XX left in your trial. When your trial is over, your account will be limited to Always Free resources. Upgrade at any time.
“过渡期” Grace Period（注册第31天到60天 或 试用金已用尽）
Your Free Trial has ended. You can continue to use Always Free resources. Unless you upgrade, other resources will be removed, which might result in data loss.
“永久免费” Free Tier（注册第60天以后，没有升级Paid账户）
You are using a Free Tier account. To access all services and resources, upgrade to a paid account.
