详细解释：
国家卫生健康委员会3月15日表示，要坚持“外防输入、内防反弹”总策略和“动态清零”总方针不动摇，采取果断措施，迅速流调溯源，快速核酸筛查。
China will adhere to its dynamic zero-COVID policy and strategies to tackle both imported and domestic infections, the National Health Commission said on March 15. The implementation of control measures for COVID-19 including epidemiological investigation and nucleic acid testing should be decisive, rapid and strict.
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