All at once

一头───One head;地───land

Otherwise one head can be swallowed by the other one.───否则其中一个脑袋极有可能被另一个吞下肚去。

It was spindly looking with a tall skinny stalk and only one head on it.───它有着细长的外形，高而瘦削的茎梗，之上只有一个头。

All these can be run up under one head.───所有的这些只需要一个大脑便可以运作。

Jim: Yes, sir. How much do you need? Customer: Not much. Only one head.───吉姆：有的，先生，您要多少？顾客：不多，一棵就够了。

I thought about how strange it was that he had two legs, two arms, one head, etc. , almost exactly like a regular human being.───他居然是两手两脚，一个脑袋…..看上去还是象人类。

And with you there shall be a man of every tribe; every one head of the house of his fathers.───每支派中，必有一人作本支派的族长，帮助你们。

All the wit in the world is not in one head. 

The attendants of Naga Royalty also possess only one head.

A person has one head and one neck.

" He would count as one head, " observed Jacques Three, in a low voice.

If you unscrew it, it actually looks like a Siamese twin bulb, with two bases and one head.