Circumstances alter cases. 情况因时因地而异,彼一时也,此一时也
(the) creature of circumstance(s) 受环境左右者
It depends on circumstances. 这取决于具体情况
under [in] the circumstances 在这种情况下,情况既然这样
under [in] no circumstances 无论如何不,决不.

in bad [needy, reduced] circumstances 贫困,穷苦,拮据
in easy [good] circumstances 生活舒适[优裕];顺遂.

a lucky circumstance 幸运的事
a mere [remote, poor] circumstance 微不足道的[无用的]事[人]
the whole circumstances 前后原委,始末根由.

with much [great] circumstance 非常详细地.

pomp and circumstance 大场面,盛大排场 (见Shak., Othello 3. 3. 354)
without circumstance 不讲虚套地,直截地.