同样的理念，只是利用更广泛的网络空间，在互助网络中，人们把自己需要的物品或者有意出让的物品列在清单上，并据此进行免费的互换。 这样的网络在世界上很多地方都有。
There are Freecycle networks in many areas — people who want to give something away, or who need something, post to the list and very often exchanges are made — for free.
保持缓存可以取代模式空间、被添加到模式空间，或者与模式空间进行互换。
The hold buffer may replace the pattern space, be added to the pattern space, or be exchanged with the pattern space.
在黑洞内，空间和时间的角色互换。
提出了一种以上送下回及下送上回互换来满足大空间空调所需的特点的送回风方式。
A ventilation method of up-supply down-return and up-return down-supply interconversion was presented in this article to meet the requirement of air conditioning in wide space.
提出了一种以上送下回及下送上回互换来满足大空间空调所需的特点的送回风方式。
A ventilation method of up-supply down-return and up-return down-supply interconversion was presented in this article to meet the requirement of air conditioning in wide space.
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