particles[i].vy = 0.0;
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.
，更多细节参见新收录的资料
Фото: Inquam Photos / Octav Ganea / Reuters
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