Balance is a key measurement equipment in the wind tunnel testing.

天平是风洞测力实验的最关键的测量设备。

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It should be noted that a balance is not always required in a wind tunnel.

应该指出，天平对风洞来说并非是绝对必须的。

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It should be noted that a balance is not always required in a wind tunnel.

应该指出，天平对风洞来说并非是绝对必须的。

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