Every child should have mud pies, grasshoppers, water bugs, tadpoles, frogs, mud turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb, brooks to wade in, water lilies, woodchucks, bats, bees, butterflies, various animals to pet, hayfields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets; and any child who has been deprived of these has been deprived of the best part of education.
我们称可见光为什么？我们称之为颜色。但颜色只是我们给光碰到某物时的行为方式起的名字。
朗兰兹纲领是对数学如何在单一框架内统一的一种愿景。
We cannot underestimate the importance of engaging local communities in energy projects.