On purchase of PED, a user should first have a clear idea about his needs and then choose a type of PED according to his English proficiency. For a non-English major, it is suitable to choose a PED with a relatively small vocabulary and clear and concise definition. As far as an English major is concerned, it is necessary to choose a PED with a large vocabulary and detailed and exact definition . 1 ，法语论文题目，法语毕业论文 |
