Long-lived objects tend to accumulate at the bottom of the heap, so they are not copied repeatedly as they are in a copying collector.
长寿的对象趋向于沉在堆的底部，这样就不会像在复制收集器中那样反复复制它们。
2
Therefore, the bottom line is that you can never guarantee that an available object will ever be collected by the garbage collector.
因此，概括地说，您永远无法保证可供收集的对象总是会被垃圾收集器收集。
3
When water temperature higher than the tank bottom water collector top of several degrees, water temperature control device will start water make the water flow.