The curl of a vector field in space is actually a vector field, not a scalar function. I have delayed the inevitable.

空间中的向量场的旋度，是一个向量场，而不是一个标量函数，我必须告诉你们。

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To make sure that the selection lists are recognized, you must add the delimiter of a space, followed by a period, followed by two spaces: " . " to the delimeter field.

为了确保能识别出选择列表，您必须将一个分隔符（这个分隔符依次由一个空格，一个句点和两个空格组成）：" . " 添加到分隔符字段。

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A key concept of General Relativity is that gravity is no longer described by a gravitational "field" but rather it is supposed to be a distortion of space and time itself.

广义相对论的一个关键概念就是，不再用引力“场”来描述引力，而是用空间和时间本身的畸变来表述。

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In fact, there's a property of gravitational fields anywhere, even in outer space, but there is some residual field between all the planets and all the stars in the universe, that the force on a body is proportional to the mass of the body.

实际上,这是任何地方的引力场都具备的属性,甚至是在外太空,在所有的行星和恒星之间,存在着某种剩余场,在这个场里作用在物体上的力,和物体的质量之间存在比例关系

耶鲁公开课 - 基础物理课程节选

The side-view mirrors on most cars are flat, and while they give drivers an accurate sense of the distance of cars behind them, they have a narrow field of view, leaving a space behind the vehicle -- the blind spot -- that a driver can't see.

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The result will be a welcome glimmer of hope for under-pressure Reds manager Roy Hodgson, who used the breathing space of his team being top of their group ahead of the game to field a team mostly of youngsters and fringe players.

BBC: Napoli 0-0 Liverpool

But now, right-handed hitters like Alex Rodriguez are forced to deal with the shift, seeing a mass of infielders in the left-field space where he used to deposit soft line drives for hits.

WSJ: The Yankees Battle a Shifting Tide