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46. (be) aware of (=be conscious of , having knowledge or consciousness)意識到,知道.

He is not aware of his danger. 他沒有意識到自己有危險。

45. on the average (=on average, on an average) 平均

On the average, there are 300 tourists a week. 每星期平均有300游客。

44. attribute…to…(=to believe sth. to be the result of…)把……歸因于……, 認為……是……的結果

They attribute their success to their teacher’s encouragement. 他們把成功歸因于老師的鼓勵。

43. make an attempt at doing sth. (to do sth.) 試圖做……

Before they fled the country, the enemy vainly made at attempted at destroying all the factories. 敵人在逃往國外前，妄圖把所有工廠都毀掉。

42. assure sb. of sth. (=try to cause to believe or trust in sth.) 向……保證, 使……確信.

We book early to assure ourselves of seats. 我們及早訂票以確保有座。

41. be ashamed of (=feel shame, guilt or sorrow because of　 sth. done) 以……為羞恥

You should be ashamed of what you have done. 你應為自己所做的事感到羞愧。

40. arrive on 到達; arrive at 到達某地(小地方);得出,作出;　 arrive in 到達某地(大地方);

You must arrive at the airport two hours early. 你必須提前兩小時到達機場。

Flight number BA 4793 will arrive in London at 16:50. 英國航空公司4793號班機于16時50分抵達倫敦.

39. arrange for sb./sth. to do sth.　 安排……做……

If you can arrange for me, I will be very grateful. 如果你能為我安排一下，我將不勝感激。

38. arise from(=be caused by) 由……引起。

Accidents arise from carelessness. 意外事故起因于粗心大意。

37. approve of (=consent to, be in favor of, favor, agree to, consider good, right) 贊成, approve vt. 批準

He do not approve of our plan. 他不贊成我們的計劃。

Her father will never approve of her marriage to you. 她父親永遠不會同意她和你結婚。