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 使聚集引起堆積或經(jīng)過(guò)積累
    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
    負(fù)責(zé)
    Powerful railroad barons (大王) made fortunes without having to be accountable to the public or considerate (關(guān)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
    與相聯(lián)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.