名词 descriptor:

1. the phonological or orthographic sound or appearance of a word that can be used to describe or identify something

2. a piece of stored information that is used to identify an item in an information storage and retrieval system

DESn.二乙基固醇（=DIETHYLSTILBESTROL)abbr.目的港船上交货(=Delivered Ex Ship)；教科部(=Department of Education and Science)destil蒸馏

1. Descriptors may be simple statements or full media components.
   描述符可以是简单语句也可以是整个媒体组件。
2. Basic functions on event descriptors and traces are introduced.
   引入了基于事件描述符和轨迹的函数。