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number and duration of sessions
届会的次数和会期

a. opening and duration of the
a．会议开幕和会期

opening and duration of the session
会议开幕和会期

12. number and duration of sessions.
12. 届会的次数和天数。

6. number and duration of sessions.*
6. 理事会届会的次数和会议天数。

number and duration of sessions (continued)
届会次数和会期（续）

moment and duration of the breach of an international obligation to prevent a given event
第26条. 违背了防止某一特定事件的国际义务的时刻和期间 67

“moment and duration of the breach of an international obligation to prevent a given event
"违背了防止某一特定事件的国际义务的时刻和期间

article 26. moment and duration of the breach of an international obligation to prevent a given event
⚈⚈⚈第26条. 违背了防止某一特定事件的国际义务的时刻和期间 9

reported half-life and residue analyses in soil suggest moderate persistence.
对半衰期和土壤中的残留的分析显示具有适度的持久性。

the half-life of rhace2 in human beings is about 10 hours and the onset of action is 30 minutes in addition to the course of effect (duration) of 24 hours.
rhace2 在人体中的半衰期约为 10 小时，起效时间为 30 分钟，作用过程（持续时间）为 24 小时。

atmospheric hcbd has a very long half-life and a transport distance of 8,784 km, which enables hcbd pollution to spread over very long distances.
大气中的六氯丁二烯的半衰期很长，飘移距离为8,784千米，这使六氯丁二烯污染可以扩散至很远的地方。

there is still not enough knowledge of the mechanisms, half-life and metabolism of pentabde in experimental animals and humans (vkm 2005).
至今对五溴二苯醚在实验动物和人体内的生化机理、半衰期和新陈代谢作用仍缺乏足够的了解（vkm，2005年）。

and when it's produced, it has a three-minute half-life, and degrades rapidly at room temperature.
一旦产生，它只有3分钟的半衰期， 在室温下，它衰减很快。