第四级的 meaning in Chinese

quartic

An alarm installation will be downgraded to this level if it has 10 false calls in 365 days ; or the key holder , without reasonable excuse , fails to return to reset the alarm system within two hours , twice in 365 days . alarm systems downgraded to the fourth level will not receive a police response for 90 days
此外，如持匙人在三百六十五天内两次未能在鸣响后两小时内回到处所重新设置警钟，但又无合理解释，则其系统亦会降至第四级。警方不会处理任何属于第四级的警钟系统，为期九十天。