the cream of the crop
最良のもの［人］，精鋭，精髄
The dog is man's best friend.
犬は人間の最良の友である
the improvement in [of] the transportation system
輸送網の改良
The meeting was well [poorly, badly] attended.
その会は集まりが良かった［悪かった］
the obligation of conscience
良心の拘束
the pick of the litter [the bunch]
複数あるもののなかで最良のもの［人］
the [a] still, small voice
良心（の声）（◆聖書より）
the sting of conscience
良心の呵責かしゃく
the worm of conscience
良心のとがめ
There is still room for improvement in his work.
彼の研究にはまだ改良の余地がある
