Perhaps they're working hard—they don't appear tobe very studious here, but they are very friendly.
也许他们工作很努力——他们在这里似乎看上去不太用功，但他们很友好。
2
Cheating is a violation of the school policy. Students are expected tobe be honest and studious. They should improve their studying methods and prepare well for exams.
作弊不对。违反校规。要诚实。努力学习，应改进学习方法，作好考前准备。
3
He devoted studious hours to getting up the subject to be discussed.