像音特美ER6和舒尔E4C一类的内置式耳机可以深入耳道，从而阻挡几乎一切外界噪音——而且音质超靓（想便宜的话，选索尼MDR-EX71）。
In-ear phones like Etymotic's ER6 and Shure's E4C go deep into the ear canal11 to block pretty much12 all outside noise—plus they sound great (a cheaper alternative is Sony's MDR-EX71).
像音特美ER6和舒尔E4C一类的内置式耳机可以深入耳道，从而阻挡几乎一切外界噪音——而且音质超靓（想便宜的话，选索尼MDR-EX71）。
In-ear phones like Etymotic's ER6 and Shure's E4C go deep into the ear canal11 to block pretty much12 all outside noise—plus they sound great (a cheaper alternative is Sony's MDR-EX71).
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