一项调查建议，我们应该将耳机音量控制在80%以内，每天的使用时间不超过90分钟。
One survey advised using earphones for no more than 90 minutes a day at 80% volume.
我最喜欢的功能就是机身左侧的耳机插孔，就在音量控制键上面。
One feature I'm happy to see is the headphone jack on the left side, just above the volume control rocker.
其它的例如播放和音量控制都从机身移到耳机线上去了。
Other controls for playing and changing the volume have been moved off the device entirely and into the wire running from the headphones.
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