[填空题]
Deuterium makes up 0.0f) ,)qjz yezy rad87j9,)4zpiooe 77dvqi y7b115% of natural hydrogev lcc0 wal-0:gn on average. Make a rough estimate of the total deuterium in the Earth's oceans and estimate the total energy released if all of ig 0v:l-cl0aw ct were used in fusion reactors.
The total mass of deuterium is about $ \times 10^{16}\ \text{kg}$
The total energy is about $\times 10^{30}\ \text{J}$
