暮色的、晨昏的——也指专挑黄昏黎明活动的那班动物：猫、鹿、蚊、萤火虫。 Of twilight; of animals, active at dawn and dusk.
Of twilight; of animals, active at dawn and dusk. 暮色的、晨昏的——也指专挑黄昏黎明活动的那班动物：猫、鹿、蚊、萤火虫。
词源etymology
拉丁语 crepusculum（暮色）→ crepuscular。 罗马人给两侧的微光各留了名字：crepusculum 是日落后那一侧， diluculum 是日出前那一侧——后者与 lucidus（明亮）同根，黎明的微光里已经掺了亮。
Latin crepusculum (evening twilight) → crepuscular. The Romans kept separate names for the two half-lights: crepusculum for the fall of evening, diluculum for the edge of morning — the latter rooted in lucidus, bright: dawn’s twilight already has light mixed in.
背景the story
17 世纪进入英语当形容词；19 世纪被动物学正式领走——crepuscular animals， 黄昏黎明才出门的那班：猫、鹿、蚊、萤火虫。
于是同一段光有了两个户口：gloaming 归诗人，crepuscular 归论文。 一个从苏格兰民谣里复活，一个在拉丁文里上班。和 gloaming 对读，正好一对。
It entered English as an adjective in the 17th century; in the 19th, zoology formally claimed it — crepuscular animals, the dawn-and-dusk shift: cats, deer, mosquitoes, fireflies.
So the same band of light holds two residencies: gloaming belongs to the poets, crepuscular to the papers. One was resurrected through Scottish song; the other clocks in wearing Latin. Read it against gloaming — they come as a pair.
中文里的邻居neighbors in chinese
中文这边意外地对称：诗有「暮色」，术语有「晨昏」——「晨昏性动物」正是现成的动物学说法。 两种语言不约而同，把同一段光拆成了抒情和学术两个户头。
Chinese mirrors it neatly: 暮色 for the poets, 晨昏 for the terminology — 晨昏性动物 is the standing zoological phrase. Two languages, without consulting each other, split the same light into a lyric account and an academic one.
Cats are crepuscular, not nocturnal — they keep poets' hours, not burglars'. 自拟例句 our own example, not a quotation The campsite ran on a crepuscular schedule, loud at dawn and dusk, dead by ten. 自拟例句 our own example, not a quotation 词典词（MW／OED），正式与学术写作正好。 写自然、写动物行为，它是本职；放进抒情散文，就像在情书里写拉丁学名。
A dictionary word (MW/OED), right at home in formal and academic prose. In nature writing and animal behavior it is on the clock; in a lyric essay it reads like a Latin binomial in a love letter.