There is much social value for the two patterns of voluntary service and obligatory work.
志愿服务与义务工作两种模式都有存在的社会价值。
If you start at a too fast rate, you may be soon overwhelmed by the amount of obligatory work.
如果开始的太快，你可能很快会被大量必须完成的任务压垮。
Publication of a scientific work is the final and obligatory stage of any research.
一篇科学著作的出版是任何研究的最终且必须的阶段。
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