After scrubbing away for half an hour I still couldn't get the mark off .
After scrubbing away for half an hour I still couldn't get the mark off .
我不停地擦了半小时，还是不能擦掉这个斑点。
After scrubbing away for half an hour I still couldn't get the mark off .
我不停地擦了半小时，还是不能擦掉这个斑点。