将以下英文句子翻译成中文并纠正语法错误。
It's important to be keeping calm under pressure to perform at your best.
在承受压力时保持冷静对于发挥最佳表现非常重要。

错误：在英文句子中，"be keeping"的结构用了进行时态和助动词"be"，而有些多余。应改成"It's important to keep calm under pressure..."。