[填空题]
Deuterium makes up 0.0115% odsaqj: ) g-0kx k-j0zuf natural hydrogen on average. Make a ron k+;0lwg0gnlk8n w0liw2.jz n +ey u,ugh estimate of the total deuterium in the Earth's oceans and estimate the total energy released if all of it were used in fusion reactors.w2k 080,+yni z .l0 wjl;genu nklgnw+
The total mass of deuterium is about $ \times 10^{16}\ \text{kg}$
The total energy is about $\times 10^{30}\ \text{J}$