我不知道什么是通古斯大爆炸，不得不去网上查了查。

I didn't know what the Tunguska incident was. I had to look it up.

youdao

确实，在通古斯卡爆炸冲击波的范围内的雪中发现硝酸盐的存在。

And indeed, nitrates are found in snow around the Tunguska blast.

youdao

确实，在通古斯卡爆炸冲击波的范围内的雪中发现硝酸盐的存在。

And indeed, nitrates are found in snow around the Tunguska blast.

youdao