1. the head of the nail, a pinhead is the head of a pin. 
   钉子的首部；图钉头就是图钉的头部。
2. In electronics, the unidirectional, pinhead electron stream generated by the cathode gun in a CRT. 
   在电子技术中，由阴极射线管（crt）中电子枪所产生的、单向细电子流。参阅crt。
3. Every library shall try to be complete on something, if it is only the history of pinhead. 
   每一个图书馆都应该努力使某一方面（的图书）齐全，哪怕只是针头[俚语亦有“笨蛋”之意]的历史也好。
4. Information technology -- quantum computing and computer chips that store trillions of bits of information on a pinhead device. 
   ?信息技术——量子计算和能在针头大的设备上存贮万亿条信息的计算机蕊片。
5. Meteors, ranging in size from that of a pinhead, to many tons, are visible to the naked eye at night, when the friction between the surfaces of the meteors and of the air, produces heat as the meteors enter the earth's atmosphere. 
   流星的大小从细若针头，大到数吨不等。当流星进入地球大气层后，其表面与空气摩擦从而产生热量，使人们在夜间用肉眼就能看到。

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