As an electric controlled element, electronic expansion valves have many advantages which traditional heat expansion valves don't have, such as high precision, and fast and correct action.

作为电控元件，电子膨胀阀具有传统的热力膨胀阀所不具备的精度高，动作快速且准确的优点。

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Roll back the tape a few thousand years to when every element of life was controlled by the tribe.

FORBES: The "On Your Own" Economy

From this September the ordinary GCSE will be reformed, with the element of coursework largely replaced by "controlled assessments" done under supervised conditions within schools.

BBC: Q&A: GCSE v IGCSE