The principle of laser marking-off equipment is introduced by use of geometric optics.

利用几何光学方法阐述激光标线仪标线的基本原理。

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Rather, the researchers have determined that the neuron signals were marking intervals of time, ticking off time-stamps down to tens of milliseconds.

更确切地说，研究人员们已经确定这些神经元信号正记下时间间隔，并以几十毫秒的速度标记时间。

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The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

扇动空气从底板的前端向前吹出，吹掉切割对象上的锯屑，从 而防止锯屑聚集在切割对象上的标记线上。

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Ms Rousseff brought him along anyway, and also made much of him at a ceremony on September 16th marking 1, 000 days till kick-off.

ECONOMIST: Football in Brazil

The match finished with a cheeky solo effort by Juninho, who again capitalised on loose man-marking by the Manchester defence to squeeze off a shot from the top left edge of the area that beat Bosnich at the right post.

BBC: Man Utd claim seven-goal classic

McCarthy played in the 1-1 draw at the Estadio da Luz on Sunday but was taken off in the second-half, marking the third successive match without a goal after a run of free scoring form.

BBC: SPORT | Football | African | McCarthy dropped to reserves