形容詞 informative:

1. tending to increase knowledge or dissipate ignorance
   同義詞：enlightening, illuminating
2. serving to instruct of enlighten or inform
   同義詞：instructive
3. providing or conveying information
   同義詞：informatory

1. Full of news; informative.
   充滿信息的; 內(nèi)容充實(shí)的
2. I dare say anything he had to say in the lecture would have been old stuff to you but since I'm not an anthropologist I found it very interesting and informative.
   我想他在講演中所要說(shuō)的每個(gè)問題，對(duì)你來(lái)說(shuō)，都可能是老生常談，但是，因?yàn)槲也皇侨祟悓W(xué)家，我倒覺得它趣味橫生，資料豐富哩。
3. Sam placed his new book on one side for a year while he wrote some magazine articles and informative material.
   薩姆把寫新書的工作擱置了一年時(shí)間，在這段時(shí)間里他寫了一些雜志文章和報(bào)道材料。
4. It will be most interesting and informative to hear Mr. Smith.
   屆時(shí)能聆聽到史密斯先生演講，定會(huì)是極為有趣和增長(zhǎng)見識(shí)的。

in.form.a.tive

adj.（形容詞）
Serving to inform; providing or disclosing information; instructive.
提供資訊的，有益的：為…提供信息服務(wù)的；提供或揭露信息的；增長(zhǎng)見識(shí)的

【引伸】
inform.atively
adv.（副詞）
inform.ativeness
n.（名詞）