请你做出我上传题目的讲解视频---**Problem (20):** 校园里有一块 198 平方米的长方形空地。学校打算将这块空地铺上草坪。张叔叔18个小时能铺完吗？ **Relevant Text (张叔叔):** Speech bubble: 我每小时可以铺9平方米的草坪。 Label: 张叔叔 **Relevant Text (亮亮's Analysis):** Introduction: 对于这个问题，亮亮是这样分析的： Analysis: 因为，198÷9>20, 张叔叔给这块空地铺好草坪需要的时间超过了20小时，所以，张叔叔18个小时肯定不能铺完。 Label: 亮亮 **Concluding Question:** 你认为亮亮的分析有道理吗？请说明理由。 **Chart/Diagram Description:** * **Type:** Illustration with speech/thought bubbles. * **Elements:** * An illustration of a man labeled "张叔叔" (Uncle Zhang) wearing overalls and a hat. A speech bubble originates from him containing text. * An illustration of a boy labeled "亮亮" (Liang Liang). A thought bubble originates from him containing text presenting an analysis. * **Overall Scene:** The images and text are arranged to present a word problem followed by a proposed solution/analysis from one of the characters, and then a question asking the reader to evaluate the analysis.