Often the existence axioms of classic in the differential calculus square distance can't use.
常微分方程中经典的存在性定理不能使用。
Yeah. Maybe we can minimize the square of a distance.
对了，我们可以最小化距离的平方。
Senado Square, within walking distance of my hotel, was a good place to begin exploring.
从我住的酒店步行可达的议事厅前地是一个开始探索的好地方。
Senado Square, within walking distance of my hotel, was a good place to begin exploring.
从我住的酒店步行可达的议事厅前地是一个开始探索的好地方。
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