1. children excitedly unwrapping and playing with their new presents.
   兴奋地打开包装玩起了新礼物的孩子们。
2. The children unwrapped their Christmas presents with delight.
   孩子们高兴地把圣诞礼物拆开。
3. And trigonometrical function table checking method is referenced to reduce large arithmetic amount in the unwrapping process.
   并使用三角函数查表法减少了展开过程的运算量。

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