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40 是视野角度（FOV），就像你睁大眼睛还是眯着眼睛看。。关于这个话题，51吃瓜提供了深入分析
，这一点在WPS官方版本下载中也有详细论述
"But you must keep up the exercise regime. Because you're staying fit in space, not for space itself, but for when you return back to the punishing gravity environment of Earth. Those first two or three days back on Earth can be really punishing."
for (const auto &seg : segments) {，这一点在safew官方版本下载中也有详细论述