光定，西夏神宗英文皇帝李遵顼的年号，历时十三年（公元1211—1223年）。
实时荧光定量PCR Real-time PCR ; real-time fluorescent quantitative PCR ; real-time quantitative PCR ; Real-time quantitative reverse transcription-PCR
曝光定时器 exposure timer
荧光定量 qRT-PCR ; CT-DNA ; Fluorescent quantitative ; NGH-DNA
激光定位器 laser locator
激光定位 laser positioning ; laser location
荧光定量PCR仪 real-time qPCR ; Real time PCR
荧光定量聚合酶链反应 fluorescence quantitative polymerase chain reaction ; FQ-PCR ; fluorescence quantitative PCR
光定向耦合器 optical directional coupler
激光定星镜 laser coelostat
电光定向耦合器 electro-optic directional coupler
某些植物种类如果感觉到了太多光就不开花，而有些只有感觉到了一定程度的光才会开花。
Certain plant species won't flower if they sense too much light and some plants will only flower if they sense a specific amount of light.
您可以用环境光模拟前面的卧室场景，将所有对象都照亮到一定程度，从而提供了另外一个全向光源。
You could model the previous bed scene with an ambient light to lighten up all objects to some degree and create an additional omnidirectional light.
例如，古人观察到了水滴和某些雕琢过的宝石可以把光按照一定的方向折射出去。
For example, ancient people discovered that drops of water and certain gemstones distorted light in a predictable way.
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