例句與造句

1. A fusor can also produce controlled fusion and is a useful neutron source.
2. Although it makes a useful neutron generator, the apparatus is not intended for power generation since it requires far more energy than it produces.
3. Cf-252 is, however, in smaller quantities a very useful neutron source for starting nuclear reactors, scanning nuclear reactor fuel rods, and neutron activation analysis in the field .)
4. It's difficult to find useful neutrons in a sentence. 用useful neutrons造句挺難的