聚合物的研究不仅仅是化学的一个分支；它是化学与生物学、物理学和工程学之间的桥梁。
Given the choice between the experience of pain and nothing, I would choose pain.
The first step in the art of cutting metals is to find a man who has the necessary skill and experience.
The writer is someone who plays with the body of his mother.