非惯常环境指游客脱离日常生活圈后，进入一种不熟悉或不常接触的环境。在出境旅游中，这种陌生常体现在语言、货币、地理气候与制度环境的差异性上。
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。体育直播对此有专业解读
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The biggest decision you’ll need to make in terms of a preamp is to decide if you want one built into your turntable or if you’d rather use a separate one. It can be very convenient, especially for beginners, to use a built-in component to amplify the signal from the turntable before it hits any speakers or headphones. The downside is that you’re left with what the company provides from the factory, so if you’re looking to upgrade, you’ll have to disable the preamp inside. On most turntables, there’s a switch that allows you to do this, so it’s no trouble. But, opting to skip the preamp on some models could save you money that could be invested elsewhere.