哪些: which ones， who, what?...
必定: to be bound to, to be sure to...
次品: substandard products, defective, seconds...
坚韧: tough and durable, tenacious...
班级: class (group of students), grade (in school)...
侧面: lateral side, side, aspect, profile...
恐怕: fear, to dread, I'm afraid that..., perhaps, maybe...
货: goods, money, commodity...
征服: to conquer, to subdue, to vanquish...
心: heart, mind, intention, center, core...
