returned in case there is no argument or the argument is not a valid 32-bit
d00755 0 0 0 /dev
。heLLoword翻译官方下载对此有专业解读
lengthGuess is small enough that a slice of that length fits into 32
"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."