你好.这样翻译最准确.
Abstract
This paper is to discribe and analyze the advertisement strategies used by enterprises in emergencies. It introduces the definition, classification and embedded business opportunities of emergency advertisement and its advantages and risks compared with ordinary advertisement. At last, it gives a primary discription of advertisement performance strategies enterprises used in emergency and the successful emergency advertisements of three enterprises to help people grasp the outstanding tactics, which can also be regarded as plain advices for people to understand and study the performance tactics in event advertisement in the future.
Key words: emergency, advertisement, entering point