管理部门的同意就是所有雇用合同的必要条件。 Agreement by the management is a sine qua non of all employment contract.
爱玛总可以这样回首往事，她周围的人全都门当户对地婚配成亲，这才是他们真正幸福的必要条件。 She could always reflect that all parties concerned had married according to their stations, a prerequisite for their true happiness.
格雷特已具备成为一名大演员的必要条件。 Greta has got what it takes to become a great actress.
