您好,Case: 情况（例证,事实）. eg. In this case time has not been taken into account. Circumstance:情况（指某事或动作发生时的情况,多用复数）. eg. The circumstances are now unfavorable to the enemy. Con...setting用在哪方面您好，setting表示"某一情形的背景或环境",如故事发生的背景或环境,尤指"舞台背景".如：Rome is the perfect setting for romance.