麦克风增益按钮，按下此钮会激活固定在麦克风内的衰减器，它是当本机工作在高噪音环境下使用。
Mic GAIN button. Pressing this button activates the built-in microphone attenuator. This feature is designed to be used when operating the Alan 9001 in high ambient noise environments.
另外，这些工具还应该经过大量的研究数据验证，并且应该便于监控和计分，无论是在何种环境下-本机构和机构外。
It was also important that the instruments had considerable research data supporting them, and that they be relatively easy to administer and score, either in our offices or in off-site locations.
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