at the longest

at the expense of

at the back

at the approach of

at the moment

at the opening

at the Beginning

at the drive end

a skeleton at the feast

at the word of command

frequency at the peak velocity

Competitive Ability at the Core

Cold tolerance at the budburst period

age at the time of surgery

distribution of point load at the intersection of beams

activity at the shallow part

bark at the moon

black point of the wheat

building with frame at the bottom

Emergency center at the frontier