显然，要使这个模型生效，每个用户都必须经过认证。
Obviously, for this model to work each user must be authenticated.
安全要求所有驾驶帆船的水手必须经过专业的指导，下水驾驶帆船必须穿上经过认证的救生衣，并保证有其它足够的救生措施。
All the sailors have been driving sailboat professional guidance into driving sailboat must wear certified life jackets and life-saving measures to ensure that there is sufficient other.
参加认证的六西格玛黑带必须经过A SQ总部的注册。
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