所以，我写了这个敌人的剧本，但是我的敌人在飞，他违反了重力定律，我不太喜欢。移动方法有问题吗？请帮帮我!他的质量是100，重力刻度设置为32。我真的不知道为什么会发生这种情况。

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

    public class CobraScript : MonoBehaviour {

        private GameObject Player;
        private Rigidbody2D Rb;
        public float Speed;
        private float AttackDelay;

        public GameObject Walking;
        public GameObject AttackPoint; 

        private AudioSource Src;
        public AudioClip Clip;

        private bool Aggro;
        public LayerMask PlayerLayer;
        public float AggroRange;
        public float AttackRange;

        public float ReturnSpeed = 0.3f;

        private bool ShouldWalking = true;

        void Start()
        {
            Player = GameObject.Find("DrawCharacter");
            Src = Camera.main.GetComponent<AudioSource>();
            Rb = GetComponent<Rigidbody2D>();
        }

        void Update()
        {
            AttackDelay -= Time.deltaTime;

            Collider2D[] PlayerFind = Physics2D.OverlapCircleAll(transform.position, AggroRange, PlayerLayer);
            if (PlayerFind.Length > 0)
            {
                Aggro = true;
            }
        
            if (Aggro)
            {
                if (ShouldWalking)
                {
                    gameObject.GetComponent<Animator>().Play("XenusRun");
                    Walking.SetActive(true);
                }else
                {
                    Walking.SetActive(false);
                }

                Collider2D[] PlayerAttack = Physics2D.OverlapCircleAll(AttackPoint.transform.position, AttackRange, PlayerLayer);
                if (PlayerAttack.Length > 0 && AttackDelay <= 0)
                {
                    StartCoroutine(Attack());

                    AttackDelay = 3;
                }

                if (Player.transform.position.x < this.transform.position.x)
                {
                    transform.localScale = new Vector3(-1, 1, 1);
                }else
                {
                    transform.localScale = new Vector3(1, 1, 1);
                }

                Vector3 dir = Player.transform.position - transform.position;
    ---->        Rb.MovePosition(transform.position + dir * Speed);
            }
        }

        void OnDrawGizmosSelected()
        {
            Gizmos.color = Color.red;
            Gizmos.DrawWireSphere(AttackPoint.transform.position, AggroRange);
            Gizmos.DrawWireSphere(AttackPoint.transform.position, AttackRange);
        }

        private IEnumerator Attack()
        {
            ShouldWalking = false;
            GetComponent<Animator>().Play("XenusAttack");
            Speed = 0;

            yield return new WaitForSeconds(0.4f);
        
            Src.PlayOneShot(Clip);
            AttackPoint.SetActive(true);
        
            yield return new WaitForSeconds(0.2f);
            
            ShouldWalking = true;
            AttackPoint.SetActive(false);

            yield return new WaitForSeconds(ReturnSpeed);

            Speed = 0.059f;
        }
    }

"""""""""""""