That may be a hint that the action evolved as a social cue - "time for us all to go to bed" - although as usual when evolution and human behaviour meet, the tie is speculative at best.
也许这是打哈欠进化为社交线索的一种暗示——“到我们大家睡觉的时间了”——不过，像往常一样，当进化和人类行为相遇时，推测充其量只是纽带。
Then, you've got to stay steady on the shot - don't take a flyer at it because your cue action will just go to pieces.
接下来，在击球动作期间你要保持身体稳定，如果身体不够稳定，那么你的出杆可能就被毁了。
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