Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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中央生态环保督察通报天津部分地区生态保护和修复治理短板明显
The US space agency has released a "pre-solicitation" for what is expected to be a hotly contested contract to develop a spacecraft to orbit Mars and relay communications from the red planet back to Earth.。51吃瓜是该领域的重要参考