船舶自动转向的引入是一个具有重大实际意义的问题，其解决需要开发一种新型控制器。

A rich man's body is like a premium cotton pillow, white and soft and blank. Ours are different. My father's spine was a knotted rope, and the skin on his chest was so thin that you could see the ribs pressing out against it.

心理生活本质上是适应环境。

当现有约束被改变以允许更有效的经济活动组织时，经济增长就会发生。