They say babies should be examined when their first teeth appear -- usually at around six months.
VOA: special.2009.03.11
So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.
让我们继续定义这些常数,我们对这些应该都很熟悉了,首先,我们有质量,m等于。
So in that sense, they should be the first to take action, no question.
所以从这一点来说,毫无疑问他们应该首先采取行动。
For example,in first grade, students should be asking and answering questions about something they read.
VOA: special.2010.03.25
They say the first shipment from the warehouse should arrive in Haiti in a few days.
VOA: standard.2010.01.18
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