在一个国家中,一个公民的自由是对另一个公民自由的威胁。
心理学家必须是一个严格的实证主义者。
"A story was a form of telepathy. By means of inking symbols onto a page, she was able to send thoughts and feelings from her mind to her reader's."
The development of formal systems has revolutionized our understanding of mathematics.