Mould.transform.localPosition = new Vector3(Mathf.MoveTowards(Mould.transform.localPosition.x, -30f, Time.deltaTime * 2f), Mould.transform.localPosition.y, Mould.transform.localPosition.z);
沿X轴移动
原文：http://www.cnblogs.com/Cocomo/p/6102728.html
