Ships use AIS partly to avoid one another. It takes a long time for a 300m-long tanker carrying hundreds of thousands of tonnes of oil to turn or come to a stop – and vessels can travel potentially many kilometres before they fully adjust their course.
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Four astronauts, including Christina Koch, will take the spacecraft to orbit the Moon in a 10-day mission and hopefully become the closest humans have been to the lunar surface since 1972.
国务院总理李强5日在政府工作报告中介绍，一年来，统筹推进新型城镇化和乡村全面振兴，促进城乡区域协调发展。。新收录的资料对此有专业解读