That means we fix a direction, we fix a ray out from the origin in a certain direction.
那就是固定一个方向,固定一条从原点出发沿固定方向的射线。
Part of the trouble, Mr Settersten and Ms Ray point out, is that in the absence of reliable public schools, parents must play a big role in the academic careers of their children.
谢特·斯丹先生和雷先生指出,部分困难是父母们在缺乏可靠的公立学校时,必须在他们孩子的学术生涯里发挥出重大作用。
"People have been demonstrating these sets for a long time. But the reason it is coming out now is because of a new standard for Blu-ray players that can show movies in 3D."
VOA: standard.2010.03.11
It might turn out if I had X-ray vision that what I see is this... Then the answer'd be there's not one train here.
有可能是,我看到的是这样。,答案就不是同一辆火车。
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