He acted out of expediency, not principle.

他的行为是出于权宜之计而非原则。

《牛津词典》

This was not from any love of the subject - I considered folklore a poor relation to literature - but out of sheer expediency.

这绝不是因为我热爱这个题材——在我心目中，民俗是文学的一个穷亲戚——而只是纯粹的权宜之计。

youdao

Ring or gem is not a gift, as a gift of expediency.

戒指或宝石并不是礼物，是作为礼物的一种权宜之物。

youdao

Not just economic expediency, Congress has substantive justification for taking a closer look at the law.

FORBES: Is the FCPA Ripe for Reform? What Sensenbrenner's Proposed Legislation Means for Business

Nonetheless, the law must not yield to expediency and the convenienceof lending institutions.

FORBES: New York Appeals Court Rejects MERS Foreclosure

Bradley insists his change of heart is not a case of political expediency.

CNN: By GEORGE ANTHAN/DES MOINES REGISTER