android--------解决Entities and POJOs must have a usable public constructor _constructor

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今天在学习android数据库，运行程序的时候报错，错误是：Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).Tried the following constructors but they failed to match:
Word(java.lang.String,java.lang.String) -> [param:english_word -> matched field:unmatched, param:chinese_meaning -> matched field:unmatched]。
【android--------解决Entities and POJOs must have a usable public constructor】解决方法:在实体类写一个空的构造函数即可。
因为我有一个有参的构造函数，于是我写了一个空的构造函数即可运行。