例句與造句

1. it is designed based on relevant theories for effective learning, and helps students to master key concepts with special features of the textbooks
   作者編寫時(shí)依據(jù)一套有效學(xué)習(xí)的原則，使學(xué)生能活用課本內(nèi)的特色，成功地掌握重要概念。
2. It's difficult to find master key concept in a sentence. 用master key concept造句挺難的