51. as luck would have it
不巧
As luck would have it there was no one home so I had to wait another 45 minutes for the next bus.

52. as sth go
就...而言
Often called the wanderer流浪者, it is tough and powerful as butterflies go and is capable of long flights at speeds of 20 miles per hour or more.

53. aside from
除...以外
Aside from this course, I’m taking modern Asian politics and advanced Japanese.

54. ask for
ask for a loan
borrow money from

55. assume sth to be true

56. at an angle / remain rigid and still
有一定角度 /僵硬不动
The worm stretches its body away from the branch at an angle and remains rigid and still, until the danger has passed.

57. at hand
near in place or time

58. at home
感到自在
I certainly hope that most of you will soon feel right at home with our group.

59. at intervals
断断续续
Homer worked on画 Breezing Up 微风习习 at intervals over a period of three years.

60. at one’s pleasure
These advisers serve at the President’s pleasure and can be fired at any time.

61. at sb’s service
willing to help sb
W: Phil, could you give me a hand with this file cabinet帮我搬文件柜? It belongs against the wall应该靠墙放next to the bulletin board.
M: At your service.

62. at the crack of dawn
I’m getting up at the crack of dawn (破晓).

63. at the dedication of
Abraham Lincoln delivered his most famous address at the dedication of the soldiers cemetery in Gettysburg.

64. at the mercy of
Without any protection against; helpless before
They are drifting in an open boat, at the mercy of the elements.

65. at the spanking rate
急速
As the Sun grows older, and uses up its hydrogen fuel氢燃料-which it is now doing at the spanking rate of half a billion tons a second-it will become steadily colder and redder.

66. at the suggestion of sb
在…建议下
It was at the suggestion of her acting coach表演教练 that the youngster, who was, by her own admission, clumsy笨拙, shapeless无体形, and on the heavy side, enrolled被收入 in a dancing class.

67. at the tip of
at the pointed end of

68. at the top of
We’re almost at the top of the hill.

69. at times
The planning function may at times be less comprehensive.

70. at will
任意
On the contrary, individuals move about at will, alone or in small groups best described as bands伙, which sometimes form into large aggregations (groups).

71. attach to
tie, connect; fasten
The virus replicates by attaching to a cell and injecting its nucleic acid.
We have to cover ourselves up so that baby cranes will not become attached to us.

72. attribute sth to sb
consider as resulting from, proper to, or belonging to a person or thing
Soldiers rarely hold the ideals that movies attribute to them, nor do ordinary citizens devote their lives to unselfish service of humanity.

73. back and forth
Mostly I’ll just be using the bike to get me back and forth from work.

74. back up
To cause to accumulate or undergo accumulation 使聚集引起堆积或经过积累
The accident backed the traffic up for blocks. Traffic backed up in the tunnel.
事故引起了交通阻塞。在地下道中引起了交通阻塞.

75. be … short
W: I found the perfect book bag, but I am about 20 dollars short (缺20元).

76. be absolved in sth
沉浸
I spent the whole weekend totally absolved in this biography.

77. be accessible to sb
Easily approached or entered
The national park is accessible to everyone.

78. be accountable to sb
负责
Powerful railroad barons (大王) made fortunes without having to be accountable to the public or considerate (关心) of customers.

79. be accustomed to
To familiarize, as by constant practice, use, or habit
I have accustomed myself to working long hours.

80. be adapted to
Bloodhounds are biologically adapted to trailing their prey.

81. be adept at
be good at
Crows are adept at avoiding researchers.

82. be allergic to sth
Having a dislike; averse
Dan is allergic to cats.

83. be around
在附近
M: Is Sally still around? I was going to ask her if she wanted to walk to class with me.

84. be associated with
与相联系
The process is associated with the formation and melting融化 of sea ice.

85. be at risk
Pains are sure sign that your hearing is at risk.