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

后来才知道，原来西伯利亚有个名叫通古斯的地方，这里曾发生过一次大爆炸，方圆几千英亩的森林瞬间被夷为平地。

Turns out there was this place in Siberia where for thousands of acres the trees were suddenly laid flat.

youdao

据信，1908年俄罗斯上空发生的强劲爆炸——通古斯大爆炸背后，有一个直径约六十米的小行星或慧星碎片。

An asteroid or comet fragment around 60 meters across is believed to have been behind the Tunguska Event, a powerful explosion that took place over Russia in 1908.

youdao