那么是如何知道火星有铪- 187的呢？

And how is it known that Mars had hafnium-187?

youdao

我要求呃剐交易全铪退款。

I demand a full refund for this purchase.

youdao

我要求呃剐交易全铪退款。

I demand a full refund for this purchase.

youdao