注册期限
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注册期限是域名注册的有效期长度。大多数 [[tld|TLD]] 允许 1 至 10 年的注册期限。域名到期前必须续费，才能继续保持所有权。
示例
Registering a .com domain for 2 years means it will expire exactly 2 years from the registration date unless renewed.