40 是视野角度（FOV），就像你睁大眼睛还是眯着眼睛看。
'The Light really did call EVERYBODY': players find Leeory Jenkins, complete with his cloth shoulderpads, defending the Sunwell in World of Warcraft: Midnight
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Finding the closest point
New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »