instructive
adj
(approv 褒) giving much useful information 提供丰富知识的; 有益的
instructive books 有教育意义的书
The minister's visit to the prison was not instructive. 这个牧师这次探监没有什麽有益的贡献.
Officials used to have trouble with the foreign names of people passing through Ellis Island, and because they were so busy, many people's names got changed in the rush.