We are reminded of this even before we view a collection by the presence of security guards, attendants, ropes and display cases to keep us away from the exhibits.

甚至在我们参观藏品之前，保安、服务员、绳子和陈列柜都会提醒我们不要靠近展品。

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Without this data from the cosmic microwave background, we can still learn a whole lot about the Universe, including its age, the presence of dark matter and dark energy.

如果没有这个来自宇宙微波背景的数据，我们仍可以去了解整个宇宙，包括其年龄，暗物质和暗能量的存在等等。

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The key difference in this study was the presence of a single gene from the H3N2 human virus: the PB2 protein, which gave the hybrid viruses the ability to spread easily among the lab mice.

这项研究中一个关键的不同点就是H3N2人类流感病毒中存在一个蛋白基因：PB2蛋白，它的存在使得杂交病毒具有了在实验小鼠之间轻易传染的能力。

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This is the first time Ballmer has introduced an application from this product line and his presence is very telling.

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Had she taken steps to remove Millie from Mr McCarney's presence, the prosecutor said "this child would not have died".

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The plot thickened yet further with the information from NBC that Twitter had informed them of the presence of this tweet and the complaint procedure.

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