emergency可数吗

　　She explained to them what to do in an emergency.

　　她向他们说明了紧急情况下应采取的行动。

　　The average response time to emergency calls was 9 minutes.

　　紧急求助电话的平均回应时间是9分钟。

　　The government had to take emergency action.

　　政府只得采取紧急措施。

　　It is important to keep calm in an emergency.

　　情况紧急的时候，保持镇静是重要的。

　　The emergency services were on hand with medical advice.

　　随时都有急诊服务，并提供医疗咨询。