世界拥有技术 - 无论是现有的还是研究中的 - 可以在可持续的基础上养活100亿人口。

Mrs. March knew that experience was an excellent teacher, and when it was possible she left her children to learn alone the lessons which she would gladly have made easier, if they had not objected to taking advice as much as they did salts and senna.

建筑应该是个好邻居。