stack.push(cur);
记住，完成是对灵感最大的尊重。那些永远停留在“构想阶段”的杰作，和从未存在过毫无区别。先完成，再完美。写完，你就已经赢了八成。然后再改。一遍，两遍，直到它配得上你最初的愿景。
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Naturally, we’ll be getting in the Pro to test and will give our opinions on how effective all of this is when we’ve spent a month or two actually using it. But if you’d rather not wait and you’re based outside the US, you can pre-order the Ultrahuman Ring Pro right now, for $479, with shipments beginning in March. If you already have an Ultrahuman Ring, you can also get a trade-in deal to help cut the cost of the new model.