Something that is momentary lasts for a very short period of time, for example for a few seconds or less. 短暂的
adjective [原级] 片刻的，短暂的；随时会发生的
The momentary relief was followed by worse suffering. 短暂的缓解之后接着是更为剧烈的痛苦。
可看作monent (瞬间) + ary (…的) → 瞬间的
