Coherence and Cohesion(简称CC)作为雅思写作四大评分标准之一, 大家都不陌生。但实际来说，很多同学不真正理解 Cohesion到底是什么（Coherence我们放到以后谈）。
根据官方解释: Cohesion refers to the way ideas are connected and is usually managed by using linking words.
想必大家都注意到了linking words。不少同学都误以为linking 就是把however, on the other hand等过渡词(transition signals)用上就可以了, 这的确是其中一部分。
比如在contrasting ideas时写上however, 举例时写for example, 引出结论时写in conclusion.
但这不是全部，还包括referencing by using pronouns(代词指代) 和using substitution （替换）。
1. transition signals
2. referencing by using pronouns
3. using substitution
今天我们只说transition signals的问题，2和3放到后面再跟大家展开。下面是评语中提到的文章，为了减少阅读时间，只给出了一个段落，段落讨论的话题是: advertising is so common that we no longer pay attention to it.
Nevertheless, there is another point of view in which the widespread of advertisements makes it a normal thing. After watching a dozen of advertisements people will see it as a mere everyday routine and cease to pay attention to the message of the advertisement. Some people may even choose to turn off a television channel, for instance, only just to avoid seeing and hearing repetitive advertisements. After a certain frequency, they start to get bored and stop paying attention to ads. Hence, in the end, the main goal of advertisements is not complete since the people whom the messages are sent out to do not receive that message. A real life example can be seen from advertisements in a particular social media platform, Youtube. In the Youtube marketing mechanism, advertisements are place before and between videos, hoping that viewers would also be forced to watch the advertisements, too. However, this is not usually the case, since many people would just click “Skip Ad” and continue on.