Sustainability in agriculture is not an option—it's a necessity for future generations.
解释:既要追悔以往的过失,也要预防将来可能发生的错误。
What good is the warmth of summer, without the cold of winter to give it sweetness.
心理学家必须避免一切形而上的假设。
The world is a great mirror, and we are the reflections.