Feedback is a powerful idea which is used extensively in natural and technological systems.
反馈是一个强大的概念，在自然系统和技术系统中被广泛使用。
我只是一个喜欢唱歌和表演的女孩。
For the best results with your children， spend only half the money you think you should， but double the time with them.
在农业中，耐心带来最甜蜜的回报。