These sentences were read aloud by real people — native Japanese speakers — for the open Mozilla Common Voice project. Listen to how a phrase sounds in real speech: the intonation, the pace, the way words run together. Two speakers mean two different people read it — compare them.
現場は開発に積極的だった
げんばはかいはつにせっきょくてきだったThe people on the ground were keen on the development.
彼にまかせたら積極的に取り組むようになった
かれにまかせたらせっきょくてきにとりくむようになったWhen I left it to him, he started tackling it actively.
更に積極的な意味において理解されねばならぬ。
さらにせっきょくてきないみにおいてりかいされねばならぬ。It must be understood in an even more positive sense.