我感激每一刻。
Sustainability isn't an option - it's our responsibility to future generations.
If we take care of the ocean, the ocean will take care of us.
As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.
两个物体的相互作用力总是大小相等，方向相反，同时出现或消失且作用于同一直线上。
文学是发现普通人身上非凡之处的艺术，并用普通的语言表达非凡的内容。