//调试：打印树、左边树和右边树的三者间距离
void DebugLogDistance() {
    Vector3 v3a = GameObject.Find("TreeCollider").transform.position;
    Vector2 v2a = new Vector2(v3a.x, v3a.z);
    Vector3 v3b = GameObject.Find("TreeCollider (1)").transform.position;
    Vector2 v2b = new Vector2(v3b.x, v3b.z);
    Vector3 v3c = GameObject.Find("Main Camera").transform.position;
    Vector2 v2c = new Vector2(v3c.x, v3c.z);
    Debug.Log("弓到右边树的距离：" + (v2c - v2a).magnitude + "M");
    Debug.Log("弓到左边树的距离：" + (v2c - v2b).magnitude + "M");
    Debug.Log("左边树到右边树的距离：" + (v2b - v2a).magnitude + "M");
}