A (fuel cell) may be based on a (proton exchange membrane).Logical formLearned from2 sentences. An engine may be powered by (proton motive force).Logical formLearned from2 sentences. Nuclei may have a (proton halo includeb).Logical formLearned from2 sentences. A proton may have a (charge distribution) with a radius of some fm.Logical formLearned from2 sentences. Electrons can be as protons.Logical formLearned from2 sentences. An atom can be with a number of protons.Logical formLearned from2 sentences. A proton can be shielded.Logical formLearned from2 sentences. A value can be for protons.Logical formLearned from2 sentences. A charge can be on a proton.Logical formLearned from2 sentences. Versions may pertain-to protons.Logical formLearned from2 sentences. Electrons may smash into protons.Logical formLearned from2 sentences. A proton can be at energy.Logical formLearned from2 sentences. A charge may pertain-to a proton.Logical formLearned from2 sentences. A nuclide can be with numbers of protons.Logical formLearned from2 sentences. (Signal enhancement) can be by (water protons).Logical formLearned from2 sentences.