This is the nine millionth ring store, and I can't find the perfect ring.
一无所获 逛了几百家店 还是找不到完美的戒指。
2023考研英语二
Long is Britain's best-known Land Artist and his Stone Circle, a perfect ring of purplish rocks from Portishead beach laid out on the gallery floor, represents the elegant, rarefied side of the form.
In the area of abstract algebra known as ring theory, a left perfect ring is a type of ring in which all left modules have projective covers. The right case is defined by analogy, and the condition is not left-right symmetric, that is, there exist rings which are perfect on one side but not the other. Perfect rings were introduced in (Bass 1960).