to add punctuation marks (= symbols) to writing so that people can see when a sentence starts and finishes, see that something is a question, etc.

to happen or cause something to happen repeatedly while something else is happening; to interrupt something repeatedly

The president spoke at length in a speech punctuated by applause. 总统的长篇大论不时被掌声打断。

He chatted freely, punctuating his remarks as often as possible with the interviewer's first name. 他自在地闲聊着，在谈论中不时对采访者直呼其名。