Active monitoring and surveillance of the natural mosquito population should accompany control efforts to determine programme effectiveness.

积极监测蚊子自然数量应是控制工作的一部分，以了解活动的有效性。

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Our new method offers genuine promise for monitoring the population of this elusive and rare insect, one that is declining across much of its European range.

这个新办法让我们真正觉得有希望监测到这一陌生又罕见的昆虫的总量。在欧洲一带大部分地区，这种昆虫的数量正日益减少。

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Therefore, the effective measures are to increase vaccination rate and immunity of the specific group, decrease the susceptible population and intensify epidemic monitoring.

因此，提高免疫接种率，消除免疫空白人群，开展特定人群的免疫，加强麻疹的监测是控制麻疹发病的有效措施。

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In addition to population monitoring, volunteers check for breakage in the 2m-high, 20km-long, 1m-deep anti-dingo and dog fence that surrounds the park, and fill up water containers placed around the reserve for the wombats each day.

BBC: Protecting a wombat species that is as fast as Usain Bolt

Accurate knowledge, and monitoring, of the population of banknotes could be a powerful tool.

ECONOMIST: Money of the future may almost literally talk

Only four of the 56 species studied in the UK Butterfly Monitoring Scheme saw an increase in population size.

BBC: Butterflies suffered in cold and wet 2012, says charity