侧卫片见下肺野可疑卵圆形不透光区。

Chest lateral shows suspicious ovoid opacity in lower lung zone.

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因此中国转向为中国版侧卫歼十一提供AL - 31f的俄罗斯。

China then turned to Russia who initially supplied the AL-31F, which are used in China's J-11 Flankers.

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北京和莫斯科在1991年首次同意侧卫的销售，许可生产合同签订于1996年。

Beijing and Moscow first agreed on the Flanker sale in 1991 with a license production contract signed in 1996.

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