由于受年龄歧视，长期失业，这些人现在已经在招聘候选者中处于底层，再加上剩余就业年限较短，种种原因都说明，在他们身上投资是不明智的。
Discrimination by age, long-term unemployment, the fact that they're now at the end of the hiring queue, the lack of time horizon just does not make it sensible to invest in them.
去年四月，当我回到那儿，这条龙的头部由于不明原因而倒塌了。
When I returned there last April, the dragon's head has collapsed for unknown reason.
但由于一些不明的原因，身体发现这蛋白有点不妙。
But for some unclear reason, the body looks at the protein and sees Trouble.
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