n.内在的气质；精神，勇气；气概

网络解释.秉性；勇气；勇气和谋略；大展身手

be on one\'s mettle 1 . 奋发，鼓起勇气 put someone on their mettle 2 . （严峻形势）使奋发，激励某人战胜困难 习惯用语 on (one\'s) mettle 1 . 奋发：准备接受挑战并尽最大努力

n.1.勇气;魄力释义下的同义词

nerve stamina courage spirit spunk pluck