at the peak of activity or excitement
au sommet de l'activité ou de l'excitation (au sommet de l'activite ou de l'excitation)
"The party was in full swing when we arrived."
"La fête était en plein essor quand nous sommes arrivés." (La fete etait en plein essor quand nous sommes arrives.)
to continue doing something as planned
The relationship between how much of something is available...
to start behaving in an unusual or uncontrolled way
at the most advanced position in a field
to aim for something ambitious
to schedule or confirm something in writing