对无监督学习来说这个目标很难实现，因为缺乏事先确定的分类。
In unsupervised learning, the goal is harder because there are no pre-determined categorizations.
焊接及在船上动明火须事先得到海事局的许可，并在其监督下作业。
Welding or working with naked fire on board must obtain permission of the Harbor Master and be done under the Harbor Master 'supervision.
出让股权来募集资本带来了责任和监督力度都不容小视，所以一定要事先做好准备工作。
Raising capital in exchange for equity brings tremendous responsibility and regulation. Do your homework.
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