Nevertheless, there exist three kinds of risks that could slow it down: regulatory, competitive and those that are intrinsic to its own model.老师这里的三个并列regulatory, competitive and those that are intrinsic to its own model.为什么前面两个要用形容词,是省略了risks吗...
We have leaped over that long period of time preceding death known as old age. 这个句子中现在分词短语preceding death (在死亡来临之前) 和过去分词短语known as old age (被称之为晚年)同时修饰中心词time,如果是并列关系为何不用and连接?