Remove the rubber plug.

拆卸橡胶塞。

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These holes were to be ground smooth, painted, and filled with a rubber plug.

这些孔要磨光，油漆，并塞以橡胶塞。

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A loop is formed by the plug, the conducting rubber and the recording device.

插头、导电橡胶及记录装置形成一回路。

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A loop is formed by the plug, the conducting rubber and the recording device.

插头、导电橡胶及记录装置形成一回路。

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