One second of arc movement is one thirtieth ofa millimetre.

一弧秒的移动是一毫米的三十分之一。

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One second of arc movement is one thirtieth of a millimetre.

一弧秒的移动是一毫米的三十分之一。

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Now their commanders say their fighters have managed to link up with a second front to the south of Misrata, creating a defensive arc around the city's southwestern flank.

现在，他们的指挥官称，现在战士们已经成功地连接起米苏拉塔南面另一条前线，在东南翼形成坚固的防线。

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The largest optical telescopes on earth can distinguish between things that are separated by about one second of arc (a 1, 296, 000th of the celestial equator).

ECONOMIST: Pulsars: In a wink | The

Its resolution is 30 billionths of a second of arc.

ECONOMIST: Pulsars: In a wink | The

With Dieng on the bench, Southerland, who had just one basket in the first half, then drained a 3 from the top of the arc to give Syracuse just its second lead of the game.

WSJ: No. 10 Louisville beats No. 12 Syracuse 58-53