Ground radar sets can "see" enemy planes at great distance through darkness or clouds, and can direct antiaircraft fire at them.
地面雷达装置可以透过夜幕或云层,“看到”遥远的敌机群,并指示高射兵器向它们开火。
Secondly, even though other objects are visible at this distance, according to Shuttle astronaut Jay Apt, the Great Wall is barely discernable, if not invisible.
其次,根据航天飞机宇航员杰伊·阿普特的说法,在这个距离能看到其他物体,不能说看不到长城,但是只能勉强辨别出来。
One day, when Ali Baba was in the forest, and had just cut wood enough to load his asses, he saw at a distance a great cloud of dust, which seemed to approach him.
一天,当阿里巴巴进到树林里,并且刚砍到了足够的木头运到驴车上的时候,他远远的望见了一大片尘土,看起来向他的方向接近过来。
The cell that's producing the signal produces enough of the molecule so that it enters the bloodstream, it circulates throughout your body, eventually it reaches a cell at a great distance, which has a receptor for that ligand and the signal gets received.
发出信号的细胞产生信号分子,数量十分充足 能够进入到血液中,信号随着血液流遍全身,最终到达较远处的细胞,在这些细胞上有与配体配对的受体,信号被细胞接收
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