户外科学课：享受阳光，放飞心情！看看谁的直升级飞的最高最远？

Outdoor science class: as we enjoy the sun, our wishes fly to the sky.? Let's see whose helicopter flies the furthest and highest?

youdao

户外科学课：享受阳光，放飞心情！看看谁的直升级飞的最高最远？

Outdoor science class: as we enjoy the sun, our wishes fly to the sky.? Let's see whose helicopter flies the furthest and highest?

youdao