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Toys and games

1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.

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旋流器收集器

Environment; Environment statistics

使用離心力拉粒子或殘值從被污染的空氣或水設備。

生物生產力

Environment; Environment statistics

速率的能量存儲在生態系統或部分須在給定的一段時間。

沙漠

Environment; Environment statistics

很少或沒有植被在哪裡的地區由於缺乏降雨或土壤乾旱。

搭便車

Economy; Economics

不付錢,不一定非法獲取良好效益或服務。這可能是可能,因為實際上難收費 — — 煙花匯演,例如某些類型的商品和服務。另一種方式來看看這可能是好或服務的正外部性。不過,可以有時有搭便車的問題,如果數位的人願意為好或服務是不夠的包括提供它的成本。在這種情況下,好或服務可能不會產生,即使,將有利於經濟整體上有它。公共貨物往往是搭便車的風險 ; 在他們的情況下,可以克 ...

免費的午餐

Economy; Economics

沒有這樣的東西。見機會成本。

無機物質

Environment; Environment statistics

主要是基於碳結構的特點是不的物質的礦物的起源。

碎石

Environment; Environment statistics

鬆散的沉積物組成無機和的死亡或腐爛的有機物質。

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