theory
理论 

例句：
Theory tell us that temperature measurements need to be repeated every five years to pick up warnings of real climate change.
理论告诉我们，温度的测量应该每五年重复进行一次，这样才能捕捉到天气变化的各种先兆。

can never be too...
越……越好；再……也不过分
    
例句：
As a teacher, you can never be too patient with slow students.
作为老师，对于落后的学生要耐心再耐心。
 

I'll treat you to dinner.
我想请你吃晚饭。  

对话：
A: Jack, do you have any plans for this evening?
B: I don't think I have.
A: Fine. I'll treat you to dinner.
B: Thank you. I 'd be delighted.
　
A：杰克，晚上你有什么打算吗？
B：我想没有。
A：好。我想请你吃晚饭。
B：谢谢你，我非常高兴。