真实变量：按实物单位衡量的变量。
那个时候，大多数的计量单位都是来源于实物、手、人体部位（比如“英尺”的英文原意为脚，英里则来源于拉丁语的miliapassuum，意为1000步）或者工具（比如桶、杯子）。
Most were drawn from things to hand: the human body (the foot or the mile, which derives from the Latin milia passuum, or 1, 000 paces) and tools (barrels, cups).
它的本质就是人们可以下载信息单位，然后交易或者转让，这其实也是当前盈利性的实物交易系统中的一种形式。
Essentially people are able to download messaging units and trade or transfer them as part of what has become a lucrative barter system.
边际实物产品，边际生产实物量从利用一单位额外可变资源加上其他固定资源中产生的总产品的变化。
The change in total product that results from employing one additional unit of a variable resource together with other fixed resources.
使用单位对提供使用的实物应当妥善保管，使用完毕，及时归还。
A user entity shall properly keep the physical objects offered for use and shall timely return them after the use.
第十三条各单位应当建立财产清查制度，保证帐薄记录与实物、项相符。
Article13. Each unit shall set up a property inventory system and ensure that the accounting records conform to the physical assets and cash holdings.
在大部分情况下，实物交易都设有最低单位数目限制。
In most cases, there is a minimum size for in-kind transactions.
任何单位不得以集资、合作建房名义，变相搞实物分房或房地产开发经营。
No entity shall allocate houses in kind or develop and operate the real estate in any disguised form in the name of building houses by collecting money or through cooperation.
第十三条各单位应当建立财产清查制度，保证帐簿记录与实物、款项相符。
Article 13. Units should set up a property-checking system to ensure that the accounting records conform with the quantities of existing materials and funds.
第十三条各单位应当建立财产清查制度，保证帐簿记录与实物、款项相符。
Article 13. Units should set up a property-checking system to ensure that the accounting records conform with the quantities of existing materials and funds.
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