just in case片語KK [dʒʌst ɪn kes] /dʒʌst ɪn keɪs/發音片語1以防萬一、以備不時之需Take an umbrella just in case; the sky looks gray.帶把傘以防萬一,天色看起來很陰。2萬一、要是用於引導子句Write down my number just in case you get lost.把我的號碼記下來,萬一你走丟了可以用。