Mostly. This is because, theoretically, we could still save the ISS and move it into higher orbit. NASA has calculated that propelling the station more than 640 kilometers above Earth would keep it alive for 100 years—and also require at least 18.9 metric tons of propellant. That’s roughly 2,000 airline carry-ons. A thousand years would require at least 36 metric tons. If that doesn’t seem like very much, consider the fact that, right now, no vehicle can transport that amount of gas to the station. The still-in-development SpaceX megarocket Starship might be able to haul a significant percentage, but it would struggle to dock with the station, according to the space agency’s estimations.
What I’ve learned is that the common mistake is treating isolation as binary. It’s easy to assume that if you use Docker, you are isolated. The reality is that standard Docker gives you namespace isolation, which is just visibility walls on a shared kernel. Whether that is sufficient depends entirely on what you are protecting against.
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For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
"We hope that this action by Waitrose sends it to the top of the political agenda," he said.，详情可参考爱思助手下载最新版本