OMI allows scientists to assess how much ozone is present at various altitudes—particularly the stratosphere—and near the ground.

依据它的测量数据，科学家们可以估定在地面附近和其它海拔高度有多少臭氧存在——特别是平流层。

youdao

The singer and actor is present at the press conference.

那位歌手兼演员出席了记者招待会。

youdao

As you can readily observe in the behavior of a baby, the Id is present at birth.

如果你观察宝宝的行为，本我是与生俱来的。

youdao

(Speaking) At present, the average price of gasoline in the United States is well below Leonhardt's barely-competitive threshold of about 75-cents per liter.

VOA: standard.2010.02.23

The id, according to Freud, is present at birth.

弗洛伊德认为，本我是与生俱来的。

耶鲁公开课 - 心理学导论课程节选

At the core of it is a belief in progress, something that was essentially not present among the Greeks.

其核心就是对于进步的信仰,实质上说这在希腊文化中是不存在的

耶鲁公开课 - 古希腊历史简介课程节选

Some people experience this as intensely bitter, even when it is present at very low levels.

ECONOMIST: Twin research

This tells you how much information is present at each position: variable positions contain little information while constant positions contain lots.

ECONOMIST: How (and why) to find a needle in a haystack | The

Prototypes built by researchers at the Naval Research Laboratory, Stanford University and Philips, a Dutch electrical-goods firm, can detect a substance that is present at a concentration of less than one part in a million billion.

ECONOMIST: Labs on a chip