这个“近”，并非指盈利轻而易举，而是指在当前的技术与市场条件下，硬件提供了路径最短、摩擦力最小、且可被清晰计算的变现通道，体现在三个维度。
if (n <= 1) return;
，这一点在heLLoword翻译官方下载中也有详细论述
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This story was originally featured on Fortune.com
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.