A good teacher should be able to infect his students with his own keenness for his subject.
一个好教师应能以自己对本学科的热爱来影响学生.
来源:《简明英汉词典》The scabbard is content to be dull when it protects the keenness of the sword.
刀鞘在保护刀的锋利时,自己也满足于自己的驽钝.
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