the company offers non-mandatory training sessions on workplace safety.
students can enroll in non-mandatory courses to expand their knowledge.
the non-mandatory vaccination is available at all health centers.
non-mandatory participation in the charity event is encouraged.
teachers assign non-mandatory reading materials for extra credit.
the gym provides non-mandatory fitness classes for members.
employees can make non-mandatory contributions to the retirement plan.
the conference includes several non-mandatory workshops.
non-mandatory exams are offered to assess student progress.
the university offers non-mandatory study abroad programs.
non-mandatory community service hours are accepted but not required.
management has introduced non-mandatory wellness programs for staff.
the company offers non-mandatory training sessions on workplace safety.
students can enroll in non-mandatory courses to expand their knowledge.
the non-mandatory vaccination is available at all health centers.
non-mandatory participation in the charity event is encouraged.
teachers assign non-mandatory reading materials for extra credit.
the gym provides non-mandatory fitness classes for members.
employees can make non-mandatory contributions to the retirement plan.
the conference includes several non-mandatory workshops.
non-mandatory exams are offered to assess student progress.
the university offers non-mandatory study abroad programs.
non-mandatory community service hours are accepted but not required.
management has introduced non-mandatory wellness programs for staff.
探索常用高频词汇