momentary

momentary, momentous

• they can only secure momentary happiness.
  他们只能获得暂时的幸福。
• it is a momentary reaction.
  那是一种短暂的反应。

• hong kong's return to china is a momentous event in 1997.
  香港回归中国是1997年的重要大事。
• this news is momentous to you.
  此消息对你很重要。

temporary, momentary, transient

形容词 momentary:

1. lasting for a markedly brief time
   同义词：fleeting, fugitive, momentaneous

1. Her feeling of fear was only momentary; it soon passed.
   她的恐惧感仅是瞬息间的，很快就消失了。
2. Except in the sonnets and poems, Shakespeare's formal sense is disguised and does not threaten. No matter how wrong this idea might be, it does give the poet bobbing in Shakespeare's wake the momentary illusion that he might be waving instead of drowning.
   除了14行诗和其他诗体之外，莎士比亚的形式感隐蔽起来了，不存在着威胁。不论这一看法多么不对，它确实使这位紧跟在莎士比亚后面浮现出来的诗人一时生产一种幻觉：他可能是有惊无险。
3. Giving a momentary or superficial impression of brilliance.
   闪烁的，炫耀的给人以短暂或表面印象的光彩或才华的
4. She hesitated in momentary confusion.
   她一时思想紊乱，犹豫不定。

mo.men.tar.y

adj.（形容词）
Lasting for only a moment.See Synonyms at transient
暂时的：仅持续很短时间的参见 transient
Occurring or present at every moment:
时刻发生或出现的：
例句：
in momentary fear of being exposed.
时刻担心被暴露

Short-lived or ephemeral, as a life.
短命的或短暂的，如生命

来源：
Middle English momentare
中古英语 momentare
from Latin môment3rius
源自 拉丁语 môment3rius
from mômentum [moment] * see moment
源自 mômentum [片刻] *参见 moment

【引伸】
mo.mentar.iness
n.（名词）