He points two fingers at his head, as if he were holding a gun.

他用两个手指对着自己的脑袋，仿佛正拿着一把枪。

To communicate, he moved two fingers to control the computer's mouse.

为了交流，他移动两根手指来控制电脑的鼠标。

To communicate with others, he moved two fingers to control the computer's mouse.

为了与他人交流，他移动两根手指来控制电脑的鼠标。

I gave him the two fingers.

我对他做了一个侮辱性的手势。

He stretched two fingers to me.

他向我伸出两个手指。