The presence indicator systems that IM users must log into required more infrastructure.

IM 用户必须登录的状态指示器系统需要更多基础结构。

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The very presence of elemental sulfur deposits on the ice in Borup Pass is an indicator that life is likely there.

博勒普通道冰原上单质硫沉淀存在的重要意义在于，这是生命存在的信号。

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Gill has been studying animals that lived around that time, using fungal spores preserved in sediment as an indicator of the presence of wildlife.

吉尔通过研究地质沉降物中保存下来的真菌孢子，来分析这段时期前后动物的生存状况。

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His presence is another indicator of how popular the event is with big stars.

BBC: Entertainment & Arts

The second phase, which is scheduled for the second half of 2011, will add in the remaining Skype features, including video, instant messaging and presence (an indicator of whether a person is available for a conversation).

FORBES: Skype And Avaya To Combine Voice First, Video Later

Another hotness indicator is the presence of those companies that have nothing to sell this year, but knowing they need to have a high profile at the show, substitute hype (usually crazy marketing stunts) for real products.

FORBES: Tipping Point Alert