self-possession
noun [ U ] uk/ˌself.pəˈzeʃ.ən/ us/ˌself.pəˈzeʃ.ən/
沉着,镇定
the characteristic of being calm and in control of your emotions at all times
He looked surprised but soon recovered his self-possession. 他看上去有点惊讶,但很快就恢复了镇定。
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