I learned the news about her mother's illness firsthand from Lena.

我接从丽娜那里了解到她母亲生病的消息。

We gather up from various sources a great amount of firsthand data.

我们从各种集了大量第一手资料。

We should acquire more firsthand information.

我们应当取更多的第一手资料。

It’s not firsthand information.

那不是第一手资料。