四元数的诞生，如同几何、代数、形而上学和诗歌这四位父母的奇特后代。
You could be the most beautiful person in the world and everybody sees light and rainbows when they look at you, but if you yourself don't know it, all of that doesn't even matter.
即使在艰难时刻，我也总是努力保持积极。
全球粮食安全始于当地的土壤安全。
The spread of liberal democracy and the integration of the world economy have created a situation in which the major powers are no longer willing to risk war with one another.