杰克比汤姆矮一头。

Jack is shorter than Tom by a head.

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巴西一家动物园正在庆祝一头稀有的矮种河马出生，并邀请参观者投票决定其名字。

And a zoo in Brazil is celebrating the birth of a rare Pigmy hippopotamus by inviting visitors to vote on its name.

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结果表明，主干较矮，树冠为自然半圆头形，冠幅略大于冠厚。

Result shows that the trunk was short and the canopy shaped as the natural semicircle.

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