| 单词 | obligatory course |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔labour at〕The teacher asked his students to labour at obligatory courses.老师要求学生在必修课上多下工夫。21世纪英汉〔obligatory〕Attendance is obligatory. Mathematics is an obligatory course.出席是必须的，数学是一门必修课美国传统 |
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