实验还研究了消声频带，误差传感器布放位置及消声区域等问题。

This study also involves frequency range of the primary sound to be con-trolled, arrangement of the error sensor and' sound-controlled regions', etc.

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一座20英尺高的钢制金字塔将被吊到塔顶该放的位置上。

A twenty-foot steel pyramid is to be hoisted into position on top of the tower.

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必须在它的位置上放一根新绳子。

A new rope had to be put in its place.

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where you can take one of them, put it back in a different place,

你可以从中租一辆用，然后把它放回到不同的位置，

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