单选题 The distinction between the two terms gateway and ＿＿＿＿＿＿＿＿ is disappearing. They are now used interchangeably. 的答案

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题目内容：
The distinction between the two terms gateway and ＿＿＿＿＿＿＿＿ is disappearing. They are now used interchangeably.
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