Shadows are most of the time a darker version of the ambient light because the ambient light gets reflected/bounced of pretty much everywhere and thus mixes with the actual color of the object.
阴影的颜色一般是比环境光更暗一些的颜色，因为环境光被不断的反射、反弹因而和物体实际的颜色相混合了。
The measurement of object signals and ambient noise at sea, as well as the analysis of its results are described in this paper.
本文主要论述对海上目标信号和海洋环境噪声的测量及其结果的分析。
Two modal identification methods undergoing ambient excitation are investigated for the object of large structures based on modern experimental modal analysis theory and ambient vibration technology.
本文以大型工程结构为研究对象，以近代实验模态分析理论及环境振动识别技术为基础，着重研究了两类基于环境振动的模态参数识别方法。
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