She lent me her pen, but later I lost it.

她把钢笔借给我，但后来我把它弄丢了。

youdao

He was scrabbling for his pen, which had got lost somewhere under the sheets of paper.

他当时正在翻找钢笔，那支笔在纸堆下的某个地方找不到了。

《柯林斯英汉双解大词典》

The lost sheep must return to the sheep pen.

丢失的羊一定要被带回羊圈。

youdao

The DuoSense pen offers the return of the lost art of handwriting and together with the true multi-touch solution opens up a whole new world of personal choice for the user in deciding how to interact with their computing devices.

ENGADGET: N-trig's Digital Pencil plays pen and fingertip roles, claims mastery of both

You know, immigration played a big role, but at that same time, you know, Mr. Le Pen - the extreme rightwing French politician - lost like over a million votes as compared to what he got a few years ago.

NPR: Large Turnout Sets Up France's Left-Right Runoff

The unencrypted USB pen drive, containing a 'stress test' safety assessment of the Hartlepool plant, was lost by an employee of the Office for Nuclear Regulation (ONR).

BBC: USB stick with nuclear plant data lost by ONR official