In slang the term "jam" constitutes a state of being in which a person finds himself or herself in a difficult situation。
同样，从上下文的定义可知jam一词在俚语中的意思是“困境”。定义句的谓语动词多为：be, mean, deal with, be considered, to be, refer to, be called, be known as, define, represent, signify, constitute等。
需要注意的是：同位语前还常有or, similarly, that is to say, in other words, namely, or other, say i. e. 等副词或短语出现。
3.根据举例猜测词义恰当的举例能够提供猜测生词的重要线索
The consequences of epochal events such as wars and great scientific discoveries are not confined to a small geographical area as they were in the past.
