The companies that make their living fighting viruses aren't happy about what's going on in Ledin's classroom.
与病毒作斗争而生存的公司对于在Ledin课堂中正在发生的事情很不高兴。
Second, as the class becomes active, students will learn with happy mood, muti-media makes the classroom more fun, which might be a significant factor in motivating the students.
第二，课堂变得活跃，学生会学得开心，多媒体让教室变得有趣，这对于学生来说或许是激励他们的一个重要因素。
I've spent many happy hours with you in the lab and the classroom.
我在实验室里、教室里和你们一起度过了许多美好时光。
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