432. Another head and chief important reason I have chosen to put here is that human activity causes greenhouse effect.
在这里，我还想强调的另外一个极为重要的原因就是人类活动导致了温室效应。

六级词汇讲解:
本句也是主体段落中引出递进关系的句子。another表示上下文的递进关系，head and chief important reason强调观点或者原因的重要性，that引导表语从句，后面陈述具体原因。

句型拓展:
Still another important quality is for the boss to have open and good channels of communication with their employees.
其次，优秀的老板应与员工之间存在公开、良好的沟通渠道。
Advertising also has an indirect impact on improving our lives.
广告也在间接地改善我们的生活。
Another reason I prefer doing leisure activities outdoors is that there's always something new and different to see.
我之所以更喜欢室外活动，另一个原因是在室外我总能看到新的或不同的东西。
A second purpose of awards or prizes is that it promotes excellence.
颁奖的另一个作用在于鼓励杰出贡献。
The other good reason for a teenager to work is to learn the value of money.
青少年做兼职的另一个很好的理由是，他们能因此而明白金钱的价值。