However, little progress was made throughout the 1990s as acquisition of fighter and attack aircraft was given higher priority in the allocation of PLAAF's budgets.

然而，在整个九十年代期间获得小的进展这由于战斗机和攻击机在PLAAF预算中给予较高的优先权。

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When a fighter aircraft or missile flies at high angle of attack(AOA), asymmetric vortexes are produced from the forebody and induce strong side force and yawing moment.

飞机或导弹在大迎角下飞行时会形成非对称涡，从而产生很大的侧滑力和偏航力矩。

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