The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.
磁场的变化是像太阳这样的恒星表面黑子活动周期的根源，尽管经过几十年的认真研究之后，地球人仍然对其知之甚少。
Users with the uppermost levels of access are able to purchase root kits to engage in fraudulent activity and contract out phases of their fraud operations to a large network of willing participants.
拥有高级访问权限的用户可以购买root kits（译者：一种黑客入侵工具）参与欺诈活动并将它们的欺诈行动外包给其他众多愿意参到其中的参与者。
The business enterprise finance management target has the root influence to the whole activity of business enterprise.
企业财务管理目标对整个企业管理活动具有根本性的影响。
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