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。
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。
Fructosyltransferase is a kind of enzyme, which catalyzes the synthesis of fructan when sucrose is present at environment.
果糖基转移酶是口腔细菌细胞外多糖合成酶之一，它以蔗糖为底物催化合成果聚糖。
Fructosyltransferase is a kind of enzyme, which catalyzes the synthesis of fructan when sucrose is present at environment.
果糖基转移酶是口腔细菌细胞外多糖合成酶之一，它以蔗糖为底物催化合成果聚糖。
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