Turn off the air conditioner, but the parents did not see the smile on his face.

空调关掉了，但是父母脸上的笑脸没有不见。

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At present, the realistic problem that Kelon Air-conditioner must face is how can gain greater marketing share and promote brand popularity on fiercely competitive market.

科龙空调在竞争激烈的市场上如何赢得更大的市场份额，提升品牌知名度是其当前所必须面临的现实问题。

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The microscopic whiskers can stop bacteria in a face mask or filter out water droplets in a hospital's air conditioner.

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