Meanings of first strangers in English

These were the first strangers we'd come across since lighting out from the train.

They were in the habit of unburdening themselves, their hopes, their disappointments, their joys, their tragedies, to the first strangers whom they met.

We were the first strangers to show an interest in her welfare and future plans, and she returned our friendship with confidence and love.

"I am not employed to tell his secrets to the first strangers who ask me!"