Question

英文问题求解。。。

it depends on how well you understand the rules by which they're working. 1. 请问这里的 by which是啥意思？2. 它可以用其它的一个关系副词所代替吗？

Answer 1

it depends on how well you understand the rules (by which they are working).
显然这是定语从句。括号中是定语从句部分，修饰先行词rules。
而【关系代词】which在定语从句中做〖宾语〗
把定语从句还原正常语序。the rules they are working by which因为which代了the rules
也就是they are working by the rules意思是【他们运行所遵循的规则】
整句话意思为〖那取决于你对他们运行所遵循的规则的连接程度了〗或者〖那取决于你对他们运行所遵循的规则了解地多么充分〗

追答

by which这里不能换成关系副词。因为没有合适的关系副词去代替by which
they are working by the rules
遵循规则by the rules
不过可以换成through the rules遵循规则

it depends on how well you understand the rules through which they are working.

Answer 2

这里“by which” 是“介词+关系代词”引导的定语从句.
which指代 the rules

追问

它可以用其它的一个关系副词所代替吗？

追答

你也可以用that 就是一个定于从句，理解这个规则，什么规则呢？that引导