The astronomer captured a fleeting glimpse of the comet before it vanished behind the clouds, leaving only a faint trail of light.
天文学家在彗星消失在云层之前，短暂地瞥见了一眼，只留下了一道微弱的光迹。
Which choice best defines “fleeting”?
D — Passing quickly; transient.. “fleeting” means Passing quickly; transient..
Which word means “Passing quickly; transient.”?
C — fleeting. “fleeting” means Passing quickly; transient..
fleeting — Passing quickly; transient.. In Chinese: 短暂的；转瞬即逝的.
fleeting is pronounced //ˈfliːtɪŋ//.
The astronomer captured a fleeting glimpse of the comet before it vanished behind the clouds, leaving only a faint trail of light. (天文学家在彗星消失在云层之前，短暂地瞥见了一眼，只留下了一道微弱的光迹。)
transient, momentary, ephemeral — all close in meaning to fleeting (Passing quickly; transient.).
permanent, lasting — each the opposite of fleeting (Passing quickly; transient.).
Yes. fleeting is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
flee(逃) → 一晃而过。