这些站点包含帮助用户优化社会协作的高级工具和功能。

These sites contain advanced tools and features which help the users optimize social collaboration.

youdao

当然，如果市场参与者的活动带来额外的(不由本人、而由社会所承担的)“外部”成本或效益，譬如污染，那么竞争就无法实现最优化了。

Of course if the activity of the market participants produces external costs or benefits-costs or benefits to nonparticipants, as in the case of pollution, competition will not optimize output.

youdao

制定全面的互联网营销策略，包括搜索引擎优化、点击付费广告、电子邮件营销和社会媒体推广。

Develop a comprehensive Internet marketing strategy that includes search engine optimization, pay-per-click, email marketing, and social media.

youdao