PHRASAL VERB 不失时机地插入 If you slip in a question or comment, you ask or make it without interrupting the flow of the conversation. 不失时机地插入 [Also VERB n PREPOSITION]
Slip in a few questions about other things. [VERBPREP. noun]
见缝插针地提几个题外的问题。
I cannot resist slipping in a word of advice. [VERBPREP. noun (not pronoun)]