+on He was so intent on his gardening magazine, he didn’ t notice me come in. 他正专注于他的园艺杂志，一点儿没注意到我进来了。
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+on: determined to do something . This expression sometimes means that you do not approve of the thing that someone is determined to do （有时意指不赞成他人的决定）坚决的，下决心的
intent on doing sth She seemed intent on making me miserable. 她似乎下决心要让我痛苦。