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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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.

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But the weak retail story was also in focus.

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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.

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