有如此一句话：A broker is one that acts as an agent for others, as in negotiating contracts, purchases, or sales in return for a fee or commission. 请问这里的 as 是连词吗？若是连词，请问为何它后面直接跟着一个介词词组 in negotiating contracts, purchases,...呢？是否无动词分句？若是，在 as 与 in 之间是不是省略了什么？各位老师能不能介绍无动词分句的入门知识给我呀？
A broker is one that acts as an agent for others, as in negotiating contracts, purchases, or sales in return for a fee or commission.
【翻译】经纪人是为别人充当代理的人，就像在洽谈合同、购买或销售中做代理，以换取报酬或佣金。
【剖析】as in negotiating contracts, purchases, or sales in return for a fee or commission：这是一个省略了主谓语的“方法状语从句”，修饰前面的定语从句。完整的表达应该是：
as he does so in negotiating contracts, purchases, or sales in return for a fee or commission
省略句不等于“无动词分句”。
