他几个礼拜前帮我换了一条新的风扇皮带。

He put a new fan belt in for me a couple of weeks ago.

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他常常直接坐在电风扇前吹风。

He would sit directly in front of the fan to cool down.

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用该系统对某级增压比2.2的单级高负荷后掠风扇进行了后掠和前掠大小叶片改型设计。

Using this design system, a high-loaded backward-swept fan with a stage pressure ratio of 2.2 was redesigned firstly as a backward-swept and secondly as a forward-swept splittered fan.

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