内容来源：https://blog.google/products/pixel/pixel-buds-2a-how-to-active-noise-cancellation/

内容总结：

谷歌近日发布Pixel Buds 2a耳机，首次为A系列产品引入专业级主动降噪功能。用户可通过三种便捷方式调控降噪模式：长按任意耳塞即可在主动降噪与环境音模式间切换，提示音会确认模式转换（该手势还可在应用程序中设置为唤醒GemAI助手）；通过手机或电脑端的专用应用，在"主动降噪控制"选项中精细选择降噪、通透或关闭功能；亦可直接使用手机音量键配合屏幕界面快速切换降噪模式。目前该产品已正式上市销售。

中文翻译：

全新Pixel Buds 2a首次为A系列带来专业级主动降噪功能。以下三种简易操作可助您随心调控声效、切换模式：

• 长按控制：轻按任意耳塞即可在主动降噪与通透模式间快速切换，伴随提示音确认模式切换（此操作可通过Pixel Buds应用自定义为唤醒Gemini功能）
• 应用调节：打开手机或电脑端的Pixel Buds应用，进入设备详情页，在"主动降噪控制"选项中可选择降噪、通透或完全关闭功能
• 手机操控：按压手机音量键后轻触屏幕控件，即可快速选择偏好的降噪模式
  了解更多Pixel Buds 2a产品信息，新品现已全面上市。

英文来源：

The new Pixel Buds 2a bring pro-level Active Noise Cancellation (ANC) to our A-series for the first time. Here are three simple ways to control your sound and switch between modes.

• Use the press and hold gesture. Press and hold either earbud to quickly switch between Active Noise Cancellation and Transparency Mode. You will hear a chime to confirm the change. (This gesture can also be customized in the Pixel Buds app to activate Gemini instead.)
• Use the Pixel Buds app. For more control, open the Pixel Buds app on your phone or desktop and go to your device details. Under "Active noise control," you can select Noise Cancellation, Transparency or turn the feature off completely.
• Use your phone's volume controls. You can also press your phone’s volume buttons and tap the on-screen controls to select your preferred noise control mode for quick adjustments.
  Learn more about Pixel Buds 2a, on shelves now.