等于but。 used to introduce a statement that adds something to a previous statement and usually contrasts with it in some way
We thought the idea sounded tempting, yet[=but] common sense told us it wouldn't work.
She designs simple yet [=but] elegant clothing.
She played well, yet she didn't qualify for the finals. [=although she played well, she didn't qualify for the finals]
Everyone seemed pleased, and yet I had the feeling that something was wrong.