镇定自若

keep one's countenance

1. 并不是人人都能在危急时刻保持镇定自若的。
   It's not everybody who can keep as cool as a cucumber in an emergency.
2. 在报社记者七嘴八舌地高声向他提问时，他始终表现得镇定自若。
   He kept as cool as a cucumber as the newspaper reporters shouted questions at him at once.
3. 尽管他受到很多的批评，但他仍然镇定自若，没有说什么。
   In spite of all the criticism he received, he kept a stiff upper lip and said nothing.

镇定的英语翻译：

自的英语翻译：

若的英语翻译：