winter [summer] vacation; 寒[暑]假
Where are you going for your vacation this summer? 今年夏天你去哪儿度假?
sick leave; 病假
overstay one's leave of absence; 超假
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)