On the Tuesday afternoon, our class carried out a meaningful public service activities.

周二下午，我们班开展了一次有意义的公益活动。

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The selected outstanding works, the authors agreed to sponsor the transfer of intellectual property free of charge, for promotion of AIDS anti-discrimination public service activities.

经评选出的优秀作品，作者同意将知识产权无偿转让主办方，用于宣传艾滋病反歧视的公益活动。

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Not allowing information about our activities in public... to be public... would be a real blow to the location-service ecosystem.

如果不允许用户分享公开活动信息，这对基于地点的网站来说将是沉重的打击。

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BBC's public-service operations were cross-subsidising its commercial activities.

ECONOMIST: The BBC