B2 not known to you不熟悉的,陌生的
B2 to not have any knowledge or experience of something对…不熟悉,不懂
More examples
Many of the technical terms were unfamiliar to me.
She felt increasingly nervous as she walked across a room full of unfamiliar faces.
I'm afraid you'll have to explain things to me, I'm unfamiliar with this system.
He sounded very much like someone I knew, but his face was unfamiliar.
People can often be hostile to anything foreign or unfamiliar.
adjective
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