The closed planetary gear drive mechanism can achieve a high transmission ratio and a high efficiency in transmitting large power with small volume, light weight and compacted structure.
闭式行星传动可在体积小、重量轻和结构紧凑的条件下实现大传动比，高效率地传递大动力。
MPEG4 is a video coding technology with the characters of high compression ratio, low requirement for transmission bandwidth and high quality of image.
MPEG4是一种压缩率高、对传输带宽要求低、图像质量高的图象编码技术。
Due to the plating coating has very low surface radiation ratio, low radiation, high transmission, infrared, prevent ultraviolet function, prevent winter and summer season indoor heat exchange.
因其所镀的膜层具有极低的表面辐射率，具有低辐射、高透光、防红外线、阻止紫外线功能，有效防止冬夏季节室内外热量交换。
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