由于四环素的滥用会给人和动物的健康带来危害，同时对动物性食品的食用安全带来不稳定因素。
Since the abuse of tetracycline would bring harm to somebody and animal's health, bring the destabilizing factor to the security of eating of the animal food.
扩充军备并不能保障安全，反而会带来新的不稳定因素。
Arms expansion, instead of maintaining security, will bring new unstable factors.
为有效评价隐伏型岩溶地段带来的不稳定性因素，有必要查明区内浅层溶洞的发育规律及分布特征。
It is necessary to ascertain developing regulation and scattering feature of the shallow karst cave in order to effectively appraise unstable factors brought by hidden karst terrain.
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