现实世界中的很多过程都具有多条线索同时动作的特性。
In real world, many processes have the characteristic that multi-strip clue act at the same time.
同时动作选择同时动作选择是指玩家在游戏中同时做某些动作。
Simultaneous action selection games are games where the players do some things simultaneously.
现在我们转到腿部：蝶泳腿有点象自由泳腿，只是两腿同时动作罢了。
Now we are going to move to the other end of the stroke: the legs.
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