Why do I fail to upload the attachment in the Course Discussion?

为什么在课程讨论区上传附件失败？

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The paper mainly elaborates the first sample of heavy equipped vehicle, in the course of its research, detecting and taking measures for the quality problem of creeper attachment split.

本文主要论述了重型装备运输车初样车，在研制过程中出现缓行器开裂质量问题的发现及解决措施。

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Audit working papers shall record the names, sources and available time of audit testimonial materials obtained in the course of audit together with the attachment of such materials as appendices.

审计工作底稿应当记载审计人员在审计中获取的证明材料的名称、来源和时间等，并附有证明材料。

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Part of the three-year course was a professional attachment.

CNN: From Our Correspondent: Hip Hop Reality

At such a time, it is imperative that the United States government and the American people not abandon a people toward whom they should feel a special attachment, given the travails Cambodia experienced in the course of the Vietnam War.

CENTERFORSECURITYPOLICY: Giving Peace A Chance In Cambodia: A Primer For US Policy

Of course almost all Irish emigrants (myself included) feel an attachment and fondness for our home country.

FORBES: Do Irish Immigrants to the Bay Area Feel Guilty for Living in Such an Amazing Place?