There are some limitations and weakness in various single purifying technologies, so the cases that the air pollution governance effect could not meet the expectation occur all the time.
由于各种单一净化技术手段均存在一定的缺陷和弱点，所以空气治理效果达不到预期的案例时有发生。
There are some limitations and weakness in various single purifying technologies, so the cases that the air pollution governance effect could not meet the expectation occur all the time.
由于各种单一净化技术手段均存在一定的缺陷和弱点，所以空气治理效果达不到预期的案例时有发生。
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