The child is rolling a ball round.

这孩子在转球.

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A spin disc insures that the ammonia and exhaust gases are perfectly mixed.

转球确保氨气和排放气体完美地混合.

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It animal trainers after the guidance. will dropthe ball will be transferred. but also jump circle.

它经过了动物训练员的指导后.会抛球. 会转球.还会跳圈圈.

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