The authors of the United States Constitution attempted to establish an effective national government while preserving autonomy for the states and liberty for individuals.

美国宪法的起草者试图建立一个有效的国家政府，同时保持各州的自治和个人的自由。

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She wants to know which strategies are most effective for preserving their health.

她想知道什么办法能最有效地保证他们的健康。

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CONCLUSION: The method is easy, feasible, quick, economic and effective in preserving bad tooth.

结论：桩冠修复方法可行，是一种简易、快速、经济、有效的保存患牙方法。

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In assessing prospective cuts and future defense programs and force structures, particular attention must be paid to preserving an effective technology base.

CENTERFORSECURITYPOLICY: Center for Security Policy | A Scorecard On The Defense Budget: Preserving Key Priorities And Programs In An Era Of Cuts

The Center believes that President Bush and his Administration simply cannot have it both ways: They must choose between preserving a small but effective chemical deterrent and pursuing a treaty that every responsible expert knows can neither be verified nor counted upon to eliminate the threat of chemical attack.

CENTERFORSECURITYPOLICY: Hapless Chemical Weapons Policy Threatens US Security

And the need for an effective law preserving constitutional rights against the enforcement of unconstitutional foreign law is both real and urgent: an independent study found fifty cases in 23 states where shariah law had been introduced into state court cases, including many appellate and trial court cases where the judges ruled for shariah law over U.S. law.

CENTERFORSECURITYPOLICY: Rollback #7: American Laws for American Courts