which引导的非限定性定语从句 可以修饰整个句子或句子中的某一部分。当which引导非限定性定语从句时，它通常指代主句中的某个部分或整个主句，并在从句中充当主语、宾语或表语。这种从句提供对主句内容的额外信息，但即使省略，主句的意思仍然完整。

例如：

1. Her house, which was built a hundred years ago, stood still in the earthquake.

2. Japan is a developed country, as is known to us all.

3. They are said to have a celebration for his success, which was a surprise to everyone.

在这些例子中，which引导的非限定性定语从句修饰了主句中的整个内容或部分内容，提供了额外的说明信息。