They can exist in two forms, which are mirror images of each other like hands.

它们可以以两种形式存在，互为镜像，就像双手一样。

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The answer came in two forms.

答案以两种形式出现。

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XML data is stored in two forms.

XML数据存储为两种形式。

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For example, a toy from the nineteenth century has two forms, a man in western clothing and a Chinese man.

VOA: special.2010.03.03

Nothing existed except water, and water existed in two forms.

什么都没有，唯有滔滔水流，以两种形式存在。

耶鲁公开课 - 旧约导论课程节选

So with problems at zero, ; which will be posted in two forms; PDF PDF for standard and PDF for hacker on cs50.net tonight, you will have the choice of implementing pretty much any scratch projects you can think of, and which subject to very few constraints.

对于问题集，我们提供了;,标准PDF以及可编程,今晚它们都会被放在CS50，net上，你可以选择任何,你想到的项目，范围不限。

哈佛公开课 - 计算机科学课程节选

Its precursor, molecules of lactic acid, exists in two forms, so-called left-handed and right-handed versions.

FORBES: Magazine Article

The skills shortage comes in two forms: higher staff turnover and rising wage costs.

ECONOMIST: Asia's skills shortage

Confusingly, this gene can exist in two forms, which produce opsins sensitive to different wavelengths.

ECONOMIST: Smell, vision and genes: More colour, less odour | The