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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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頻率
Agriculture; Animal feed
1.的每秒的交變電流週期數 (示例: 60 週期每秒或每秒 60 赫茲)。 2.操作發生的時間單位的次數。頻率是所有聲音的基礎。 A 泵或電機的基本頻率等於它的速度在每秒抽分庭的數量乘以革命。 ...