Landolt chart

例句：

1. 1.The Landolt chart is a usefultool for teaching children basic math concepts.
   兰德洛特图表是教授儿童基本数学概念的有用工具。
2. 2. In the study of statistics, the Landolt chart is oftenused to illustrate the concept of probability.
   在统计学研究中，兰德洛特图表常被用来说明概率的概念。
3. 3. The Landolt chart was developedby German physicistand mathematician GeorgLandolt in the early 20th century.
   兰德洛特图表是由德国物理学家和数学家GeorgLandolt在20世纪初开发的。