This completes the optional portion of this exercise.

这个练习的可选部分也完成了。

youdao

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.

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。

youdao

Furthermore if such surveys are considered optional surveys then we believe the right to exercise the option is not left to the contractor, but to the Employer or his representatives.

而且如果这样的监控将被视为可选监控，我方相信其选择权也不是承包商的而是业主或者其代表的。

youdao

The bottom line is that innovation is not an optional exercise.

FORBES: Inspiring and Enabling Evolutionary Innovation -- From Middle Managers