Well , what could be more sisterly than that ?

还有什么比那样更像是姐妹呢?

She gave him a sisterly kiss .

她像姐姐一样亲了他一下。

Her bright eyes are full of sisterly affection when she speaks to him .

对他说话时,她明亮的眼睛充满了姊妹般的爱。

L felt quite sisterly towards him , but I couldn 't marry him .

我感到对他如同兄妹一般，但我不能同他结婚。

I had no nice sisterly feelings at all .

我根本没有那种可亲的姐妹感情。