unity 物体按住key后移动和转向

//前后移动，左右转向    private int Speed_run = 5;    private int Speed_rot = 20;private void key_hold()    {         if (Input.GetKey(KeyCode.W))        {            transform.Translate(Vector3.forward* Time.deltaTime*Speed_run);        }        if (Input.GetKey(KeyCode.S))        {            transform.Translate(Vector3.back* Time.deltaTime*Speed_run);        }        if (Input.GetKey(KeyCode.A))        {            this.transform.Rotate(Vector3.up  * Time.deltaTime * -Speed_rot);        }        if (Input.GetKey(KeyCode.D))        {            this.transform.Rotate(Vector3.up * Time.deltaTime * Speed_rot);        }    }