In China and ancient Greece, people focused the sun's rays with mirrors or glass to light fires.

在中国和古希腊，人们用镜子聚合太阳光来生火。

youdao

In China and ancient Greece, people focused the sun's rays with mirrors or glass to light fires.

在中国和古希腊，人们用镜子聚合太阳光来生火。

youdao