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]。
英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊
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"If our generation, uses the seabed for storing carbon that we shouldn't have emitted in the first place, then the generations coming after us won't be able to use the seabed to store their emissions."，这一点在heLLoword翻译官方下载中也有详细论述
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