Finally the existence of the limit cycle is obtained by using the stability theory of the weak focus.

最后根据细焦点的稳定性判断出极限环的存在性。

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Small telescopes see a lot of sky but can detect only strong signals. Large ones, which can detect weak signals, have a narrow focus.

大型的望远镜虽可以检测到微弱的信号，却只有很小的焦距。

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LG's focus on feature phones made it a weak player in the smartphone game, but the Korean electronics giant now wants to make up for lost ground in the super-phone category.

LG关注手机外观，令其在智能机领域相形见绌，但是如今这家韩国的电子设备巨头，很想在高端手机上收复失地。

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Sometimes there is a strong focus on slavery but weak punishments, says I.L.O.official Roger Plant.

VOA: special.2009.06.08

The company lost about 10, 000 net subscribers due to a seasonally weak Q2 and focus on getting only high quality subscribers.

FORBES: Dish Disappoints With Subscriber Losses But Is Still Headed To $33

But the weak retail story was also in focus.

FORBES: The Fast Disappearing 'Santa Rally' And The 'Ghost Town' Which Is JC Penney

Its 3% yield may put off some income-hungry investors, but Kilroy has shown it can grow even in a weak economy and has good strategic focus, with a dominant position in its geographic centers.

FORBES: Five Builders And REITs For Real Estate's Rebound