They fly so excitingly, picking up speed from the waves, then cavorting exuberantly rather higher while looking for food.
它们在海面上奋力翱翔，借助海浪之力获取速度，忽而飞升到高空寻找食物。
Cash is cheap (you won't get charged extra to use it), but it's not necessarily safe to carry a wad of it around when cavorting in unfamiliar locales.
用现金支付便宜（用现金不用支付任何附加费用），但是当你在一个陌生的地方玩乐的时候，拿着一大笔的钱，那就有点不安全了。
Cash is cheap (you won't get charged extra to use it), but it's not necessarily safe to carry a wad of it around when cavorting in unfamiliar locales.
用现金支付便宜（用现金不用支付任何附加费用），但是当你在一个陌生的地方玩乐的时候，拿着一大笔的钱，那就有点不安全了。
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