学生不仅可以选择自己的学习方式，而且可以在家里学习而不去学校。
Students can not only choose their own ways to study, but also can study at home without going to school.
这样的话，我认为存储过程，触发器，外键是可选的，而不是强迫的，因此我可以自由的选择不去用它们。
As far as I am concerned the use of stored procedures, database triggers and foreign key restraints is OPTIONAL, not MANDATORY, therefore I am free to exercise my option not to use them.
男性可以选择调整工作安排去接孩子放学，也可以选择工作而不去接孩子，然后又为此而感到内疚。
Men have the choice to arrange their schedules so they can pick up the kids from school twice a week. And they have the choice not to, and then to feel guilty about this choice.
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