Applications by Pengyu-Ren

Dictionary Book is a simple dictionary app with very useful Features: 1. search word definition. 2. pronounce the word 3. save your words into a list 4. save your personal lists. 5. print your word list and specific word definitions as a word card.

If you are suffering from linear algebra, this app will help you a lot. Matrix Calculator will help you calculate all kind of matrix operations (add, subtract, multiplication, transpose, inverse, determinant). ◊You can input Integer or Letter.