Some plants mainly use day length as an indicator of the season.
一些植物主要使用日长作为季节的指标。
Day length
原声例句
IELTS Reading
IELTS Reading
Wigge explains: 'Oak trees rely much more on temperature, likely using phytochromes as thermometers to dictate development, whereas ash trees rely on measuring day length to determine their seasonal timing.
Wigge 解释说：“橡树更依赖于温度，可能使用光敏色素作为温度计来指示发育，而白蜡树则依靠测量日长来确定它们的季节时间。
中文百科
白天 Daytime
（重定向自Day length）
白天，在地球上是表面上给定的任意点，受到来自太阳的自然光，也就是阳光，直接或间接照射的状态。
相对之下，其它的行星，在旋转之下也会因为被恒星照亮，也会经历白天的状态。但是此处主要论述地球上的白天。
英语百科
Daytime 白天
（重定向自Day length）
On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight.
Other planets that rotate in relation to a luminous primary, such as a local star, also experience daytime of a sort, but this article primarily discusses daytime on Earth.
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