英语释义
1. a small book for teaching children to read
2. a small introductory book on a subject
3. a short informative piece of writing
4. a device for priming especially a cap, tube, or wafer containing percussion powder or compound used to ignite an explosive charge
5. material used in priming a surface — called also prime coat
6. a molecule (such as a short strand of RNA or DNA) whose presence is required for formation of another molecule (such as a longer chain of DNA)
7. a book or other writing that introduces a subject
8. a molecule (as a short strand of RNA or DNA) whose presence is required for formation of another molecule (as a longer chain of DNA)