过去总是在变化。它不是固定的。过去并不稳定。
The past is always changing. It is not fixed. The past is not stable.
Chemistry is the silent architect of our everyday lives.
人心中的每一个念头,天地都会知晓。如果善恶没有得到相应的报应,那么天地间必然存在偏私。
Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
The future belongs to those who can harness the power of both nature and technology.
成人必须了解,儿童需要运用双手,并认同儿童第一次运用双手时,只是工作本能的展现。
"In observational studies, we often have to rely on assumptions that are not directly testable."