现有8升、5升、3升的容器各一个，均无任何度量标记，其中8升的容器装满油，其他两个为空。要求用上述容器倒来倒去，分成两份4升的油。（内附实验报告）-Existing eight liters, 5 liters, each a 3-liter container, no any measure mark, eight liter container filled with oil, the other two are empty. Requirements for the container s