agree about sth. （双方/各方）对某问题有一致看法
和 be in agreement with/on sth. 有相同意思。
相比
agree with （对一个人/一个观点）同意或认同
agree to (sth./ do sth.) 愿意/同意
例句：
John and I agree about the harmful effects of smoking.
John and I are in agreement on the harmful effects of smoking.
John and I agree with the statement that smoking is harmful.
John has agreed not to ever smoke again.
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