Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.
Waymo's testing phase deploys Waymo vehicles with human drivers to cities where the Google-owned company is looking to roll out its ride-hailing service. During this phase, Waymo effectively gleans knowledge from the human drivers to best understand the lay of the land.
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习题链接：LeetCode 901. 股票价格跨度
Mass die-offs rising among farmed salmon