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This is normal. In the North of winter, it is very cold.
这很正常了。在北方的冬天，天气很冷的。
youdao
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It is very difficult to attain the decent control result to use normal PID control.
用常规的PID控制很难达到令人满意的控制效果。
youdao
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It is very difficult to attain the decent control result to use normal PID control.
用常规的PID控制很难达到令人满意的控制效果。
youdao