我国大多数高等工科院校设有机械类专业，几乎无一例外，机械类专业的学生必须学习《机械原理》、《机械设计》（原名《机械零件》）两门课程，有一部分学校还安排了《机械系统设计》课程。对于机械类专业的学生来说，学习上述课程的基本内容是必须的，也是重要的。但课程这样 Most of our higher engineering colleges have mechanical majors. Almost without exception, mechanical majors must study two courses of “mechanical principle” and “mechanical design” (formerly “mechanical parts”), and some schools also arrange The “mechanical system design” course. For mechanical majors, it is essential and important to learn the basic contents of the above course. But classes like this