To begin your performance in English, you can say "Let's begin" or "Let's start" or "Let the show begin". These phrases are commonly used to signal the start of a performance or event.

Here are some example sentences:

"Ladies and gentlemen, let's begin the concert."

"Let's start the play by introducing the cast."

"Without further ado, let the show begin!"

In Chinese, these phrases can be translated as:

"女士们先生们，让我们开始音乐会吧。"

"让我们通过介绍演员阵容开始播放。"

"接下来，让表演开始！"