18．顯而易見(jiàn)，現(xiàn)代社會(huì)正在步入一個(gè)使機(jī)機(jī)對(duì)話變得十分便利的新時(shí)代．（when）It is obvious thatour modern societyis stepping into a new era，when robot-to-robot communicationsare made very easy．．

分析 It is obvious that our modern society  is stepping into a new era，when robot-to-robot communications are made very easy．

解答 結(jié)合句意可知句子用一般現(xiàn)在時(shí)．主語(yǔ)從句中用現(xiàn)在進(jìn)行時(shí)．
本句中it為形式主語(yǔ)，that引導(dǎo)的為一主語(yǔ)從句，其中when引導(dǎo)的為一定語(yǔ)從句（從句中使用被動(dòng)語(yǔ)態(tài)）．
step into意為"邁進(jìn)，進(jìn)入"；robot-to-robot communications意為"機(jī)機(jī)對(duì)話"．

點(diǎn)評(píng) 注意主語(yǔ)從句的用法，當(dāng)that引導(dǎo)的主語(yǔ)從句位于句首時(shí)引導(dǎo)詞that雖然不在從句中充當(dāng)成分不能省略．

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