imperturbable

即使在混乱的交通中，她依然保持着镇定自若的态度。

Even in chaotic traffic, she maintains her ___imperturbable composure.

尽管面对混乱的场面，老师依然保持镇定自若，继续授课。

Facing the chaotic scene, the teacher remained ___imperturbable and continued the lesson.
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