With tie social system, therefore, the pre-history of human society comes to a close.

因此，人类社会的史前时期就以这种社会形态而告终。

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Pre-registration will be required, and generally close three days prior to the race.

要求赛前报名，比赛日三天前结束报名。

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Pay close attention to the internal management of enterprises, and pre-sale and after-sales service.

狠抓企业内部管理，及售前、售后服务。

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Pay close attention to the internal management of enterprises, and pre-sale and after-sales service.

狠抓企业内部管理，及售前、售后服务。

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