self._lock = threading.Lock()
If rationals tend to be relatively resistant to approximations, it might be tempting to assume that the situation with irrational numbers is going to be worse. But, to cut to the chase, here’s the plot of approximations for r = π:，这一点在快连下载-Letsvpn下载中也有详细论述
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这就是这套体系最精妙的地方：它让战争的成本变得不可见。
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