N-COUNT A pinhead is the small metal or plastic part on the top of a pin. 大头针的平头
It may even be possible to make computers the size of a pinhead one day.
有一天，甚至有可能把计算机做得象针头一样小。
We are pinheads of the history.
我们是历史的针头。
Some stars look as tiny as pinheads, but they are even bigger than the sun in fact.
有些星星看起来像针尖儿一样小，但它们实际上甚至比太阳还大。
And instead of hatching as tadpoles, the offspring emerge as miniature versions of their parents-some not much larger than pinheads.
而且它孵出来的也不是蝌蚪，它的后代在刚孵出来时就拥有了跟父母一样的外表，只是尺寸小了点，有些跟针头差不多大。
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