Unity3D 延時執行函數StartCoroutine

IEnumerator particleTrackWaitToSet(float fTime, bool bFlg)
    {
        yield return new WaitForSeconds(fTime);
        m_particleTrackLeft.particleEmitter.emit = bFlg;
    }      

StartCoroutine(particleTrackWaitToSet(2.0f, true));