碎片句,固名思义,就是不是一个完整的句子,没有主语,或者没有谓语,比如：
In Janpan,during the earthquake and just before the world cup.
Working far into the night in an effort to salvage her little boat.
Some of the students working in Professor Espinoza's laboratory last semester
等等,这些都是碎片句,不是一个完整的句子.