以下为句子列表：
英文: 1954 Nautilus, the first U.S. nuclear submarine, was launched at Groton in Connecticut.
中文: 美国第一艘核潜艇鹦鹉螺号在康狄格州柯罗顿市下水。
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英文: 1959 The U.S. first Polaris submarine, George Washington, was launched at Groton in Connecticut.
中文: 美国第一艘北极星潜水艇乔治·华盛顿号在康涅狄格州格罗顿下水。
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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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