The speed and reactions are controlled by control rods and a moderator.

燃料棒放置在反应堆中心，核反应就在这里发生。速度和反应是由控制棒和减速剂来控制的。

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Research in foreign language teaching involves a lot of variables, such as dependent variables, independent variables, moderator variables, control variables, and intervening variables.

外语教学研究往往会牵涉到许多种变量，但主要的有这样五种，即因变量、自变量、调节变量、介入变量以及控制变量。

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Research in foreign language teaching involves a lot of variables, such as dependent variables, independent variables, moderator variables, control variables, and intervening variables.

外语教学研究往往会牵涉到许多种变量，但主要的有这样五种，即因变量、自变量、调节变量、介入变量以及控制变量。

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