linger on a subject

• 踌躇； 考虑; 絮絮不休地说一件事

linger on a subject的用法和样例：

例句

1. He hesitated a moment before he answered her.
   他踌躇了一会儿回答她。
2. After a long hesitation, he told the truth at last.
   踌躇了半天，他终于直说了。