2012_04_03 zeitgeber n 授時 An environmental cue

Word of the Day for Tuesday, April  3, 2012
zeitgeber \TSAHYT-gey-ber\, noun:
An environmental cue, as the length of daylight, that helps to regulate the cycles of an organism's biological clock.
The light–dark transition Zeitgeber is widely used by plants to set internal clocks not just for leaf movement but for many other activities as well.
 -- John King, Reaching for the Sun
The most prominent zeitgeber in humans is the light/dark cycle.
 -- Harold R. Smith, Cynthia Comella, Birgit Högl, Sleep Medicine
Zeitgeber comes directly from the German word which literally means "time-giver." It entered into English in the 1970s.
授時\ TSAHYT gey-BER\，名詞：

環境線索，如白晝的長度，有助於調節有機體的生物鐘週期。

明暗過渡授時被廣泛應用於植物，不只是葉以及許多其他活動的運動，但設置內部時鐘。
- 約翰國王，達到太陽

在人類最突出的授時是光/暗週期。
- 哈羅德·R·史密斯，辛西婭科梅拉，比吉特Högl，睡眠醫學

授時直接來自德語單詞的字面意思是“時間者。”它在20世紀70年代進入英語。