他下棋的时候，镇定从容，很有气度。

When he plays chess, he is calm and collected. He really has presence.

youdao

在应对华尔街金融风暴上，奥巴马的镇定从容与麦卡恩的哗众取宠形成了鲜明的对照。

Mr Obama's calm and collected response to the turmoil on Wall Street contrasted sharply with Mr McCain's grandstanding.

youdao

那些日本人表现得镇定且从容。

The Japanese have acted calmly and deliberately.

《柯林斯英汉双解大词典》