A teacher must have a healthy body, the skills of a farmer, the mind of a scientist, the interest in art, and the spirit of social reform.
创新和技术将是满足世界日益增长的能源需求同时减少环境影响的关键。
我不敢说自己从未担心害怕过。 实际上我希望少一点担心害怕,因为它让我分心,使我焦虑。