This seapower approach to the world became the sine qua non of early American foreign policy.

这种对世界的海权方针成为早期美国外交政策的必要条件。

It found favour, and in particular it accelerated the completion of a genome-sequencing project for the animals-a sine qua non for any self-respecting model organism.

这一想法得到了青睐，尤其是会加速动物基因组测序项目的完成，这是任何靠谱的模式生物的必要条件。

Identifying the focal conflict is the sine qua non of brief psychodynamic psychotherapy.

识别焦点冲突是简短心理动力学心理治疗的必要条件。