In an interview with CGTN on April 3, China's top respiratory expert Zhong Nanshan said lockdown measures adopted by some countries in Europe or the United States are not effective as they are not exactly implementing real lockdown. He said that the lockdown should go deeper and be stricter, stressing the importance of social distancing to stop the spread of the coronavirus. "Nobody can block, can stop the spreading or stop the infection of this kind of disease. But we can try to do our best to inhibit the spreading. So, that's what we are successful," he added.