[Ex. 3] Translate the following passage into Chinese. SEO vs. SEM If you are an ecommerce professional that ’ s not been living under a rock, you are plagued by the SEO vs. SEM debate. SEO as well as SEM are terms that can mean different things to different people. So let me clarify what I mean by those terms. By no means are these expected to be comprehensive definitions, but they serve the purpose of accuracy and simplicity. What Is SEO? Activities you undertake on your website, such as maintaining a certain keyword density, or on other websites, such as link building, with the intention of ranking higher on search engine results pages, is called Search Engine Optimization (SEO). What Is SEM? Paying search engines to send qualified traffic your way, probably using a pay-per-click mechanism, is Search Engine Marketing(SEM). It can easily be argued that SEM is much broader than what I have just described and ,in fact, includes the practice of SEO. So that we can come to some actionable conclusions, I am isolating SEO from other SEM activities. It is easy to get stuck in an SEM-only approach, as that is what bears fruit initially. But price per click might soon rise to levels that your business may not be able to sustain. So it is good to build your organic leg too. Also, SEO is turning out to be an irritatingly moving target.