Each one-to-one association is buried as a foreign key in the table of either class.
每个一对一的关联在表中任一类中充当外键。
I have to keep order in the class and answer their question one by one.
我必须要保持课堂纪律，一个个回答他们的问题。
A class should have one, and only one, reason to change.
一个类只能因为一个原因而改变。
I would like to teach English one-on-one outside of class.
想在课余时间一对一教英语。
We can provide Small-class teaching and one-to-one teaching.
小班型授课、可为学习者提供一对一教学；
We can provide Small-class teaching and one-to-one teaching.
小班型授课、可为学习者提供一对一教学；
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