Casting DisplayObject.parent makes controlling parent movie clips hard.

向上溯型DisplayObject . parent使得父对象的clips很难控制。

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Adopting the method of the solid-liquid composite casting, the new type anti-impact and anti-wear hammer head, in witch the soft material and hard material are alternately arranged, were made.

采用固-液复合铸造的方法，制造出一种软硬材料相间、抗冲击及耐磨性能高的复合锤头。

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It is hard to build a precise math model for counter-gravity casting process for its time lag, uncertainty and complexity.

由于反重力铸造过程的时滞性、不确定性、复杂性，难以建立精确的数学模型。

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There is no open casting for actors in Saudi Arabia and it is hard to find either women or girls to appear on film because it is regarded negatively by conservatives in the country.

BBC: Haifa al Mansour becomes first female Saudi director

It would much prefer to play war games, casting India as its ruthless enemy, rather than tackling the cripplingly hard problems of government.

ECONOMIST: The riddle of Pakistan | The