The evening altogether passed off pleasantly to the whole family. Mrs. Bennet had seen her eldest daughter much admired by the Netherfield party. Mr. Bingley had danced with her twice, and she had been distinguished by his sisters. Jane was as much gratified by this as her mother could be, though in a quieter way. Elizabeth felt Jane's pleasure. Mary had heard herself mentioned to Miss Bingley as the most accomplished girl in the neighbourhood; and Catherine and Lydia had been fortunate enough to be never without partners, which was all that they had yet learnt to care for at a ball. They returned therefore, in good spirits to Longbourn, the village where they lived, and of which they were the principal inhabitants. They found Mr. Bennet still up. With a book, he was regardless of time; and on the present occasion he had a good deal of curiosity as to the event of an evening which had raised such splendid expectations. He had rather hoped that all his wife's views on the stranger would be disappointed; but he soon found that he had a very different story to hear.
这一句which was all that they had yet learnt to care for at a ball. 这里的yet是什么含义?有了yet, 那么这句话的含义又是什么?
如果没有yet, 即which was all that they had learnt to care for at a ball. 含义有什么不同呢?