They asked to remain anonymous.

They asked to remain anonymous. (they asked to remain anonymous)

意思：

👉 他们要求保持匿名。
👉 他们要求不要透露身份。

重点：remain anonymous

anonymous /əˈnɑːnəməs/
= 匿名的；不公开姓名/身份的

remain = 保持……状态

所以：

remain anonymous
= 保持匿名 / 不透露身份

例如：

The donor wished to remain anonymous.
捐赠者希望保持匿名。

She asked to remain anonymous.
她要求不要透露自己的身份。

整句话拆开

They asked
= 他们要求

to remain anonymous
= 保持匿名

所以：

They asked to remain anonymous.
他们要求匿名。

这里的 asked to do something 是很常见的结构：

ask to + 动词
= 要求/请求做某事

例如：

He asked to leave early.
他要求早点离开。

She asked to speak to the manager.
她要求和经理谈谈。