// 步骤1：计算每辆车的到达时间（精确浮点数，禁止取整）
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Councillor David Merrett, chair of the Arlingham Parish Council and dairy farmer, said: "When we first had the email about it, I thought it was a joke."
final chat = await model.createChat(tools: tools);。关于这个话题，搜狗输入法下载提供了深入分析