The reason: it once had water.

原因就是：她曾经有水。

youdao

Wuxi is famous for its water but it once had trouble because of water.

无锡因水著名，也曾因水而困。

youdao

The planet is probably rocky, Fabrycky said, but any water or atmosphere it may once have had would have evaporated early in its lifetime.

法布瑞基说，行星很可能是由岩石组成的，如果它曾有过水或空气的话，也在早年就蒸发掉了。

youdao

Once the biplane had been reassembled, it was put into the water and McClean took off, flying eastward to the Nile Delta, before turning south for Cairo and landing on the Nile.

BBC: Frank McClean: Forgotten pioneer of the sky

The law's strict liability provisions could be interpreted as requiring drillers to treat a mine discharge in perpetuity once they begin withdrawing water from it, even though they had no role in creating it.

WSJ: Pa. pushes drillers to frack with coal mine water