Useless pain management techniques, whether they involve poisonous drugs, pulsating your body parts with low voltage, rubbing your skin or using other inventions, only postpone the agony while the disease behind it will continue thriving. 请问:这个句子的pulsating your body...inventions是否做pain management techniques的后置定语呢？whether引导的部分只包括they involve poisonous drugs这里吧？ 如果pulsating...inventions是属于whether从句的内容，为什么其用的是分词形式而不是像involve一样用一般时态呢？