Panda bear is a kind of docile lovely animal in the southwest of China. Because of its cherubic appearance and awkward movement, it also symbolizes the spirit of peace and harmony, which is cherished by Chinese people. However, expansion of human activities to wild areas has caused a sharp decrease in the number of panda bears.
通过判断，我们发现修改前的一二两句之间存在因果关系，因此加入because of 将它们连在了一起;而修改前的第三句和前两句之间是一个并列关系，因此加入了also;最后一句话的意思和前面明显出现了转折，通过however来体现这种转折关系。经过修改之后，几句话被有机地结合在了一起，形成了一段篇章而非四个独立的句子。
不过，在充分使用各种连接语的同时，也应该注意不同词性连接语的用法，比如连词很自由，and，but，so这些连词的后面可以跟名词或者句子。但是介词(介词短语)后面只能跟名词，比如because of， instead of，in addition to等等;而副词(副词性短语)的后面只能加句子，比如however, in addition, as a result等等。
刚才看到的是一些词或短语充当transitions的情况，其实transitions还有另外一种体现方式就是transitional sentences，比如很常见的让步状语从句：
Even if traveling with a companion could bring us financial and some other benefits, this type conducts our traveling experience to a mechanical boring event.
从这个句子中可以看出由even if引导的让步状语从句，说明了这句话之前的内容论证的是traveling with a companion的好处，而主句则是讲这种方式让我们的旅行成为意见机械无聊的行为，也是后面要论证的一个主题，前后两部分之间显然是转折的逻辑关系。出现在文章之中可以有效地连接上下文，使之变得连贯：
I concede that traveling with a companion may have one or more benefits. One ofthe most obvious advantages is saving money. In other words, Traveling in a group would be much cheaper than traveling alone. In my observation, travel agency, the most common group-travel organization in China, reserves a prerogative of paying considerably less on tickets fees, traffic costs, and so forth than individuals. Moreover, individuals have to purchase some necessaries, like tent, when traveling by themselves, but if we go hiking with one or two friends, we could pay for these shared outfits together. Another advantage of traveling in a group is that we have accompaniers to communicate with. But I believe that this advantage is only desirable for those who often feel lonely and like clatter.
Even if traveling with a companion could bring us financial and some other benefits, this type conducts our traveling experience to a mechanical boring event.People might not arrange his or her own plan if he or she is traveling in a group, because all group members should be restricted by lots of rules, such as the place where we have to reside, the time when we can play or must gather, etc. For instance, when I followed a travel agency to Hangzhou which is one of the most beautiful cities of China last year, hardly did I finish my visit because of the time restriction ordered by the cicerone. In contrast, if I would have traveled alone, I could manage my journey flexibly. To some extent, losing freedom means losing interest in a team traveling.英语作文
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