形容詞 nocturnal:

1. belonging to or active during the night
2. of or relating to or occurring in the night

1. Nocturnal animal such as bats and owl only come out at night.
   夜行動(dòng)物，如蝙蝠和貓頭鷹只在夜里才出來(lái)。
2. Nocturnal animals such as bats and owls only come out at night.
   夜行動(dòng)物，如蝙蝠和貓頭鷹只在夜里才出來(lái)。

noc.tur.nal

adj.（形容詞）
Of, relating to, or occurring in the night:
夜間的：屬于，關(guān)于或發(fā)生于夜間的：
例句：
nocturnal stillness.
夜間的寂靜

Botany Having flowers that open during the night.
【植物學(xué)】 夜間開(kāi)花的
Zoology Most active at night:
【動(dòng)物學(xué)】 夜晚最活躍的：
例句：
nocturnal animals.
夜間活動(dòng)的動(dòng)物

來(lái)源：
Middle English
中古英語(yǔ)
from Old French
源自 古法語(yǔ)
from Late Latin nocturn3lis
源自 后期拉丁語(yǔ) nocturn3lis
from Latin nocturnus
源自 拉丁語(yǔ) nocturnus
from nox noct- [night] * see nek w-t-
源自 nox noct- [夜間] *參見(jiàn) nek w-t-

【引伸】
noctur.nally
adv.（副詞）