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我试图在Unity中制作一个游戏，我已经制作了动作，但现在我想制作命令游戏模式，但每次我尝试使用对象"left. Execute"时，我都会在标题中得到错误-"Assets\Character. cs（23，13）：错误CS0201：只有赋值、调用、递增、递减、等待和新建对象表达式可以用作语句"这是我的代码。
Commandclass.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Commandclass
{

    public interface Execute
    {
        void Execute();
    }

Character.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Character : MonoBehaviour
{
    float speed = 3f;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        Vector3 position = transform.position;
        
        if (Input.GetKey(KeyCode.LeftArrow))
        {
            //position.x += speed * Time.deltaTime;
            Lmovements left = new Lmovements(position);
            left.Execute;
        }

        if (Input.GetKey(KeyCode.RightArrow))
        {
            position.x -= speed * Time.deltaTime;
        }

        if (Input.GetKey(KeyCode.UpArrow))
        {
            position.z -= speed * Time.deltaTime;
        }

        if (Input.GetKey(KeyCode.DownArrow))
        {
            position.z += speed * Time.deltaTime;
        }
        transform.position = position;
      
      
    }
}

Lmovements.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Lmovements : Commandclass.Execute
{
    Vector3 cdirection;
    float speed = 3f;

    public Lmovements(Vector3 direction)
    {
        cdirection = direction;
    }

    public void Execute()
    {
            cdirection.x += speed * Time.deltaTime;
    }
}