这是英语中（特别是口语）惯用的表达方式，意思是that后面跟的事情或者情况比较有可能发生。The odds are that he won't come tomorrow. “他明天大概是不会来了。”类似的表达方式还有Chances are. 上面一句话可以改写为：Chances are that he won't come tomorrow. 中文意思不变。
