with [at] a stroke of the pen
書類へのサインだけで
at (around) about 5 a.m.
５時ごろ
at (the time of) birth
誕生の時に
at [with] (5%) interest
（５分の）利息をつけて
at (the) last count
最新の集計では
at (the) most [least]
多く［少なく］とも
At (the) most, twenty children will go on the hike.
ハイキングに行く子どもはせいぜい２０人だろう
at (high) noon
正午（ぴったり）に
at (the) peep of day [dawn]
夜明けに
at (a) quarter after [((英))past] ten
１０時１５分に
