at [before, until] daylight
夜明けに[前に,まで]
at different speeds
それぞれに違った速度で
at double the speed
2倍の速度で(◆定冠詞・所有格などの前に置く)
at dusk
夕暮れに
at ease
くつろいで
at Easter
復活祭の期間に
at eight (o'clock) on the dot =on the dot of eight (o'clock)
きっかり8時に
at every (possible) opportunity
あらゆる機会を捕らえて
at every step
ひと足ごとに
at eye level
目の高さに