1.At first my new surroundings were difficult to tolerate.

开始的时候，新的环境让我难以忍受。 在"主语＋be＋adj.＋to do"结构中，不定式常用主动形式表示被动意义。 Such a book as you showed me is_difficult_to_understand.

你给我看的这类书是很难理解的。 2.The air seemed thin, as though its combination of gases had little oxygen left.

空气似乎很稀薄，好像在混合气体中剩下的氧气很少。 as though/if意为"好像"，在句子中引导方式状语从句。 Everything in my childhood crowded my mind as_though/if_they_had_just_happened.

童年的一切一下子涌入我的脑海，仿佛刚刚发生似的。 3.Just relax, since there is nothing planned on the timetable today.

你可以好好休息一下，因为按时间表我们今天没有任何出行计划。 本句结构为"There be ＋名词/代词＋非谓语动词"。 I'm very glad that there_are_so_many_American_students_loving Chinese.

我很高兴有这么多美国学生喜欢汉语。 　　

　　1．(教材 P17)FIRST IMPRESSIONS第一印象

　　impression n．印象

　　the first impression　　　　　 第一印象

　　leave/make a(n) ... impression on sb.

　　 给某人留下......印象

　　①My first impression of him was that he was a kind and thoughtful young man.

　　我对他的第一印象是他是一个善良且体贴的年轻人。

　　②Premier Li Keqiang made a good impression on the people all over the world.

　　李克强总理给全世界人民留下了良好的印象。

　　impress vt.　　　　　 给......留下深刻印象；使铭记

　　impress sb. with sth. 某事(物)给某人留下深刻印象

　　be impressed with/by 对......印象深刻；被......所打动

　　impress sth. on/upon sb.

使某人铭记某事(物)；使某人对某事(物)印象深刻