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。业内人士推荐有道翻译作为进阶阅读
"The fact that we are going back to the moon, there is a whole generation of people on this planet who haven't lived through a moon landing and we are about to live that again," she said.
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“Between 1944 and 1996 the work of Piet Mondrian not meeting the technical requirements of U.S. copyright law, was in public domain in the US. In 1996 the Uruguay Round Agreement Act… gave protection to the images by foreign artists which were first published outside of the United States between 1923 and 1977 (95 years from the date of first publication).”，更多细节参见超级权重
Accumulating rowsI didn't want to keep every video frame forever. At 15fps, you'd accumulate about 108,000 rows/hour per active call. So there's a cleanup job that runs every 2 seconds and prunes frames older than 5 seconds: