lǎo / shī / yòng / jiǎn / dān / de / shí / yàn / bāng / zhù / xué / shēng / lǐ / jiě / yǔ / zhòu / sù / dù / de / gài / niàn

老师用简单的实验帮助学生理解宇宙速度的概念。

The teacher used a simple experiment to help students understand the concept of escape velocity.