sudden [ˈsʌdn]

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n.突然，忽然；adj.突然的，意外的，快速的

happening or done quickly and without warning

All of a sudden he turned about and saw me. 他突然转过身来看见了我。
The horse was badly frightened by the sudden noise. 那匹马被突然而来的嘈杂声吓坏了。