在某方面与某人达成一致意见固定短语是agree with sb on sth.那么After a long discussion , we (三个单词)on what steps we should take in zhe next two months.(达成理解)至多用英文翻译是什么/通常world 前面需要加定冠词。有时却不需要,那是什么情况下呢?比如This is our contribution to ( ) world of 21st century 中需要加吗?