2. 可堆叠微凭证（Stackable Credentials）： 学习者可以先获得短期微凭证或行业认证证书，在工作中分阶段积累，最终转化为完整的学位。这种模式将前期投入风险降至最低，特别受到成年转行者的青睐 [43, 51]。
It was dramatically extended after the spacecraft Butch and Suni had used to travel to the International Space Station suffered technical problems.
。夫子对此有专业解读
Архивное фото. Фото: Steve Lynes / Wikimedia
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