It was once thought that the fungus that ants cultivate was a single type that they had propagated, essentially unchanged from the distant past.

人们曾经认为，蚂蚁培育的真菌是它们繁殖的一种单一品种，自远古时期以来基本上没有改变。

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Good separation of co-ions and counter ions cannot be achieved by a single type of the singly charged NF membranes.

采用单一的荷电纳滤膜是不能实现同名离子和反荷离子之间的高效分离的。

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Other documents contain variations on a single type

其他文档包含了单一类型的变体

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And all ion channels are selective for a single type of ion, and we can think about how that selectivity takes place, and that's where this idea of atomic radius is going to become very important.

所有的离子通道都是仅对某一种离子具有选择性的，而我们可以来想一想这种选择性是如何发生的，这也就是原子半径这个概念将会变得，非常重要的地方。

麻省理工公开课 - 化学原理课程节选

And if you are looking at a keyboard, we can predict in the real time very rapidly that beat your very single finger typing speed, exactly the letters you like to type and hit, therefore provide a communication mechanism that Christopher Reeve and those similar with him can benefit from.

如果你在看电脑键盘，你可以十分快速地,实时预知自己手指敲击键盘的速度，预知你想录入的字母，这样便为克里斯托弗·里夫,和其他你说熟悉的人提供了一种沟通机制，使他们从中受益。

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But work has already started to produce a vaccine based on just one single type of "B" meningitis.

BBC: Vaccine hope for deadly brain bug

As a result, it is necessary to collect only a single type of plastic to ensure the desired material properties.

ENGADGET: Fujitsu making laptops from unwanted CDs and DVDs

So no single type of investment in Yale's endowment amounts to as much as a quarter of its total value.

ECONOMIST: Investment strategies