设计意图: 孩子们在玩电脑的时候注意到了那个计时的小沙漏,于是大家关注起计时的问题来,开始研究哪些东西可以用来计时,古代和现代的计时工具有什么不同,等等。由于时间概念比较抽象,运用沙漏这种古老的计时工具是帮助孩子感知速度的快慢,理解时间概念的较好途径。 Design Intent: Kids noticed the time-laden hourglass while they were playing with the computer, so they focused on timing issues, started to investigate what things could be used for timing, what were the differences between ancient and modern timekeeping tools, and so on. Due to the abstract concept of time, the use of the hourglass, an ancient timekeeping tool, is a good way to help children perceive the speed and understanding the concept of time.