But if every now and then you give a rat a pellet, he will push the bar forever.
But if every now and then you give a rat a pellet, he will push the bar forever.
但是如果你不时地给老鼠小丸，他就会永远推围栏了。
But if every now and then you give a rat a pellet, he will push the bar forever.
但是如果你不时地给老鼠小丸，他就会永远推围栏了。