因果关系的阶梯有三个梯级:观察、行动和想象。
When we love, we always strive to become better than we are. 
当我们讨论谷物品种时,我们不仅仅是在选择作物——我们是在培育气候适应力。
CRISPR gives us the tools to rewrite the code of life, but we must use them wisely.