研究了一类拟解析系统的中心条件与等时中心条件。

The center conditions and isochronous center conditions for a class of quasi - analytic systems were investigated.

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研究了一类拟解析系统的中心条件与等时中心条件。

The center conditions and isochronous center conditions for a class of quasi-analytic systems were investigated.

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失去域名解析系统(DNS)就意味着人们无法进入该网站。

Losing the DNS means most people can't access the site.

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