这些研究著作值得细致学习，既因为它们在今天仍在被广泛引用，也因为它们的透彻程度和实用性至今也不能被超越。
These research books are worth studying in detail because they continue to be widely cited today, and because their clarity and relevance have not yet been surpassed.
商务英语具有很强的应用性和实用性的特点，所以商务英语学习的学习环境就非常的重要。
Business English has very strong application and the characteristics of function, so the study of the study of business English environment very of importance.
实验证明，此控制系统具有较强的自适应性与自学习能力，表明了该方案的正确性与实用性。
Experiment demonstrates that the system has good self adaptability and self studying ability, certifying the correctness and practicability of the proposed scheme.
应用推荐