形容世事变化无常,难以预测。
The study of consciousness must be free from all metaphysical influences.
数学的美在于它允许我们抽象出现实世界的复杂性,专注于基本原则。
The first erroneous assumption is that quality means goodness, or luxury, or shininess, or weight. Quality means conformance to requirements.
"To be an actor is to be a perpetual student of life."