A second, more concrete type of threat arises if a rat spots a cat at the other side of the meadow.

第二种威胁则更为确定，老鼠能够发现草地另一侧的猫。

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If reinforced concrete structural components emerge quality failures, the structural safety will suffer the serious threat, so these failures must be handled on time.

钢筋混凝土构件出现质量问题后，框架结构的安全性将受到严重威胁，必须进行及时处理。

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Howerer, concrete slab cracks pouring high-rises construction, has been a major threat to the quality, and a main obstacle which is hard to overcome.

然而混凝土楼板的裂缝问题，已成为困扰高层楼房建筑质量的一大障碍，且已成为目前较难克服的质量通病之一。

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Israeli and Indian media report the Counter-Terrorism Bureau in Jerusalem has upgraded a warning to Israelis and other foreigners traveling in India about a "concrete threat" against Jewish facilities here.

VOA: standard.2009.10.16

However, the ones caught in Thursday's attacks were there in defiance of an official Israeli warning against travel to Egypt because of a "concrete" threat of terrorist attack.

BBC: Optimism in 1979 has failed to develop into close ties

This despite the fact that proposals for assessing risk in such areas as aviation do not grow out of an omnivorous desire to "spy on citizens" but out of a concrete need to protect people from a clear threat.

CENTERFORSECURITYPOLICY: Balancing security and privacy during wartime