以下为句子列表：
英文: A dynamical model of H2 fuel cell stack with water balance is developed in this paper for studying steady and dynamical performances of proton exchange membrane (PEM) fuel cell stacks.
中文: 摘要提出和建立了包含水平衡的氢燃料电池堆的动态模型，用于研究质子交换膜(PEM)燃料电池堆的静、动态性能。
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英文: A proton has a positive charge and an electron a negative charge, but a neutron has neither.
中文: 质子带正电，电子带负电，而中子既不带正电，也不带负电。
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英文: A proton or a neutron has about the same mass as a hydrogen atom.
中文: 质子或中子的质量和氢原子的质量大致相同。
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英文: A proton or a neutron, especially as part of an atomic nucleus.
中文: 核子质子或中心，尤指作为原子核的一个组成部分
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英文: An inept understanding of the structure of the proton therapy facility will ensure a more mature planning and implementation of such a medical engineering program across the century and many cancer patients can be benefited.
中文: 如对筹建质子治疗设备的内容有充分的认识，当会更成熟的推动是项跨世纪的医学工程，使得多癌患受益。
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