1·I choose swimming class as my optional subject.
我把游泳课作为我的选修课。
2·Curriculum design is a data structure, one of the optional subject, on the train scheduling.
是数据结构课程设计的可选题目之一，是关于车厢调度的。
3·The new teaching standard has regulated that mathematic history is an optional subject in the middle school.
新课标中已明确规定数学史作为选修内容进入中学课程。
4·Martial arts is a traditional sports in China, and be listed in syllabus as an optional subject in many colleges an universities.
武术教学在我国各高校相继开设了几十年，成为高等学校学生限定性体育选修课的主要教学内容。
5·Subject: The Subject field – if one was included as an optional parameter to the publish API call along with the message.
标题：标题字段 – 如果这是包含在消息中作为发布API的一个可选参数的话。
6·Thee duration lasts 19 months. Students are required to finish the core subject, obligatory subject and relevant optional course stipulated in teaching plan.
学习期限19个月， 罹要求学员修完教学计划规定的核心课程、必修课程及相关选修课程。
7·To set up a basic educational platform of common knowledge and strengthen and widen the fundamental principles, optional courses of basic subject should be increased.
打通公共基础，建立通识教育基础平台；拓宽学科基础课，增加基础学科选修课；
8·Problems Sets, Exams, Reading Assignments, and optional Writing Assignments all contribute to an understanding of the subject.
习题、测验、阅读作业以及选择性书写作业皆有助于对此主题的理解。