disappear suddenly and completely
突然不见;消失
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Moira vanished without trace .莫伊拉消失得无影无踪。
gradually cease to exist
逐渐消失
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the environment is under threat — hedgerows and woodlands are vanishing .环境正受到威胁,一些灌木与林地在日渐消失。
【数】 变为零。
"Middle English: shortening of Old French