A word which can express an exclamation, a call or a response is called an interjection.
叹词是表示感叹、呼唤、应答的词.可以表示惊讶、赞美 、 埋怨、叹息等感情.
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Apparently well, then. Used in expressing astonishment, disapproval, or sarcasm.
明显地; 那么. 用来表示惊讶 、 不同意或者嘲讽.
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The Senate expressed at the unsafe state of the airport, and at a lack of security.
参议院对机场的危险状态和安全设施的缺乏表示惊讶.
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The Foreign Office in London has expressed surprise at these allegations.
位于伦敦的英国外交部对这些说法表示惊讶.
《柯林斯高阶英汉双解学习词典》
