theory,理论，-ize,使。

1. By studying the way people behave, we can theorize about what is going on in their mind.

通过研究人们的行为方式，我们可以从中推断他们内心的想法。

2. It is a capital mistake to theorize before one has data.

在得到这些事实之前就加以推测,那是最大的错误.

3. To theorize in advance of the facts biases one's judgment.

如果未查明事实即先立论[推理],判断难免失之于偏颇.

4. What's important is to get things done, not to theorize about them.

重在做, 不在说空话!

5. It is a grave mistake to theorize before one has data.

在尚未掌握数据资料之前建立理论,是一种严重的错误.