尤其是以前人们缺乏必要的科学知识，对人和自然的理解常常靠自己的想象，

尤其是以前人们缺乏必要的科学知识，对人和自然的理解常常靠自己的想象，

Results (English) 1:

Especially in the past, people lacked the necessary scientific knowledge, and their understanding of people and nature often depended on their own imagination.

Results (English) 3:

Especially in the past, people lacked necessary scientific knowledge and often relied on their own imagination to understand people and nature,