Many consumers seem to have been influenced by stock-market swings, which investors now view as a necessary ingredient to a sustained boom.
主干:Many consumers seem to have been influenced
非限定性定语从句:which investors now view as a necessary ingredient to a sustained boom. 修饰 stock-market swings。
翻译:尽管很多消费者似乎一直受到股票市场波动的影响,投资者却把这种波动看作持续繁荣必不可少的一个因素。