at [with] the push of a button
ボタン１つ押すだけで；いとも簡単に
at the [a] rate of 60 miles an hour
時速６０マイルの割合で
at the regulation speed
規定の速度で
at the request of ...
…の要請で
at the sight [the sound, the thought] of ...
…を見て［聞いて，考えて］
at the start of the winter
初冬に
at [on] the stroke of midnight
深夜０時ちょうどに
at [on] the stroke of twelve
１２時が鳴ると；１２時きっかりに
at the time of expiration
任期満了のときに
at the top of a table
上座に
