例如：

In the fight for the realization of economic and social sustainable development, the relationship between economic and environmental issues is clearly on the table.

The relationship between economic and environmental issues is clearly on the table in the fight for the realization of economic and social sustainable development. 

上面两个句子都没有语法错误，但是两个句子的重心却不一样。第一句话的重心在于fight，第二句话的重心则是relationship。

例如：

Data were collected from 5000 patients by the physician.

在这个句子中，by the physician放在句末，并非重要信息，因此可以省略，得到：

Data were collected from 5000 patients.

如果想要强调动作的发起者是physician，而不是其他的人，则可以直接用主动语态，即：

The Physician collected data from 5000 patients.

例如：

Initial categories were then subsumed into more encompassing categories.

这句话非常难理解，可简单表述为

Initial categories were then expanded to include a greater number of factors.

这两句话的意思是一样的，但第一句话中使用的词汇更加高级，如subsumed into、encompassing categories，这就会让大多数读者很难理解。

例如：

Brian injury incidence shows two peaks: the rates are the highest in the very young and the elderly.

Brian injury incidence peaks in the very young and the elderly.

同样的意思，第二句比第一句更简洁明了。如果要缩减论文字数，这一点非常重要。