She also included unfertilized plots as a scientific control.

她还把一些不施化肥的地块作为科学控制组。

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To establish a strong command system to strengthen coordination, scientific control, and strengthen responsibility and strict discipline.

要建立强有力的指挥系统，加强协调，科学调度，强化责任，严明纪律。

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Hoover, who had worked as a professional engineer, championed scientific flood control.

FORBES: American Pyramids

The Secretary of Health and Human Services (Secretary), through the Director of the Centers for Disease Control and Prevention and other scientific agencies within the Department of Health and Human Services, shall conduct or sponsor research into the causes of gun violence and the ways to prevent it.

WHITEHOUSE: The White House

"However, there are a range of factors we need to consider in making a decision on badger control, including public opinion, scientific evidence, animal health and the impact on farming communities, " he said.

BBC: UK public opposed to badger cull, opinion poll suggests