arc second 弧秒 ; 角秒
magnitude per arc second square 等每平方角秒
second of arc 弧秒 ; [天] 角秒
micro-arc-second 微角秒
N of a degree of an angle 角秒; 一度的三千六百分之一
For a specific fire control dynamic performance test system, its measurement result was 2.34" by using the method, which improved angle precision from 20 to 5 arc-second."
利用该方法测得某型火炮动态性能测试系统的测角精度为2.34″，将该系统的测角精度从20″提高到5″以内。
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。
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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