eager 强调"对成功的期望"或"进取的热情"，含有积极向上的意思 anxious 强调"担心"或"焦虑"，对结果感到不安 　　③Zhou Yang is anxious to know the result of the exam, for he's eager to be admitted into the university.

　　周阳急切地想知道考试结果，因为他渴望被大学录取。

　　assist vt.帮助；协助；援助

　　 帮助某人做某事

　　(2)assistance n. 援助；帮助

　　come to one's assistance 帮助某人

　　(3)assistant n. 助手；助理；售货员

　　①I am willing to assist you with your Mandarin.

　　＝I am willing to assist you to_learn (learn) your Mandarin.

　　＝I am willing to assist you in learning (learn) your Mandarin.

　　我乐意帮助你学习普通话。

　　②The charity aims to provide assistance (assist) to people in need.

　　这个慈善组织旨在为那些处于困难中的人提供帮助。

　　concentrate vi.& vt.集中；聚集

　　(1)concentrate on/upon (doing) sth.

　　　　　　　　　　　　 专心(做)某事

　　concentrate one's mind/attention/energy/efforts on

　　 集中注意力/精力于；专心于

　　(2)concentration n. 集中精力；专心

　　①She has turned down several invitations to star at shows in order to concentrate on her studies. (2017·全国卷Ⅲ)

　　为了专心学习，她已经几次拒绝了演出邀请。

　　②I cannot concentrate_my_attention_on my book with all that loud music going on.

　　吵闹的音乐声不绝于耳，我无法集中精力看书。

　　③Some people take dancing lessons or exercise classes to improve their concentration (concentrate) and coordination.

一些人参加舞蹈课程或健身课程来提高他们的注意力和协调性。