前言
正文
a bit * a little
a most * the most
a number of * the number of
a part of * part of
a second * the second
about * on
above * over
accept * receive
accident * incident
across * over
across * through
act * action * activity
act as * act for * act like
actual * real * true
add to * add up * add up to
affect * effect
(be)afraid of * (be)afraid for * (be)afraid to
after * behind
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