Attached is an email they received which shared in vitro data. 这句话 they received和which shared in vitro data是否都是修饰email?两个which 的定语从句能否修饰一个先行词?
Attached is an email they received which shared in vitro data.
这就是所谓双重定语从句。they received从句省略了作宾语的关系代词that,先行词为an email. which 定语从句的先行词为an email they received. 即二个定语从句不在同一个层次上。