Cell biology studies structure and function of cell and activity rule and phenomena of life of cell, and is a important basic subject of current medicine.

细胞生物学是研究细胞的形态结构和功能以及细胞的生命现象和活动规律的科学，是一门重要的现代医学基础学科。

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As a general rule, all forms of activity lead to boredom when they are performed on a routine basis.

一般来说，当任何活动以一种常规的形式开展时就会变得无聊。

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Transition rule - defines which activity comes next after the end of previous activity, based on the registered facts

转移规则——基于已注册的事实，定义前一个活动结束之后跟着是哪个活

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The last activity on this rule was in November 2009.

FORBES: The Lawless Society of ETFs

He suggested outside elements had entered Egypt from "more traditional sites of extremism", such as Saudi Arabia and northern Sudan, and did not rule out activity by al-Qaeda.

BBC: Middle East Christians facing 'extremist atrocities'

Persons ultimately not covered by the Rule are prevented from making meaningful contributions to or engaging in fundraising or other activity for candidates ultimately not covered by the Rule.

FORBES: Are Investment Firm Workers' Political Speech Rights At Risk?