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The country has established some strong political institutions .

这个国家已经建立了一些强大的政治体制。

Another clearly established risk factor is exposure to ionising radiation .

另一个明显的确定风险因素是暴露于电离辐射。

National courts operate inside established systems of law-enforcement .

国内法在既定的法律强制系统中执法。

But the company has since established itself as a leader in the field .

但亚马逊之后成功地把自己定位成该领域的领头羊。

These findings suggest the difficulty in changing established eating habits and highlight the importance of obesity prevention .

这些发现表明改变已建立的饮食习惯的难度，并强调了肥胖预防的重要性。