The fuel cells could be used as auxiliary power units to produce electricity when an aircraft is on the ground, for example, allowing its engines to be turned off.
燃料电池可以当做辅助供电单元使用，比如，当飞机在地面时，可以允许关闭飞机发动机。
2
Intervening IAP expression or function in tumor cells has already been studied as an auxiliary therapy of traditional tumor treatment.
干涉IAP分子在肿瘤细胞内的表达或功能已被作为肿瘤传统治疗方法的辅助治疗方法来研究。
3
Thirdly, the increase of consistency among cells can improve the performance of the stack, and reduce the power and size of the auxiliary systems of the engine.