Despite having a brain no bigger than the tip of your index finger, pigeons have a very impressive visual memory.
尽管鸽子的大脑只有人的食指尖那么大，但它们的视觉记忆力却非常惊人。
Tip: to find out how much memory is allocated to main buffer pools, issue.
提示：为了发现分配给主缓冲池的内存有多少，可以发出。
Tip: PHP automatically releases the memory used by result handles at the end of the script.
提示：PHP会在脚本程序执行完毕后自动释放所使用的结果内存。
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