Nina had been playing the piano...是什么意思？

Nina had been playing the piano...

尼娜一直都在弹钢琴。

Nina

n. 尼娜(Anna的昵称) (f.)；

例句
He said he'd ask Nina for a divorce, but he never did anything about it.
他说会跟尼娜提出离婚，可是他却从未付诸实际。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

been

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

playing

v. 演奏( play的现在分词 )，演出，参加比赛，捉弄；

例句
By his own admission, he is not playing well...
他自己承认表现欠佳。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

piano

n. 钢琴，<美俚>囚犯工作席，轻奏乐段；

例句
He sang 'My Funny Valentine' to a piano accompaniment.
他在钢琴的伴奏下演唱了《我可爱的情人》。