Iran has been under constant criticism for its nuclear program.

伊朗一直因为其核计划受到指责。

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China's nuclear facilities and nuclear activities have all along been in safe and stable state and, in particular, the safety level of nuclear power stations has witnessed constant improvement.

中国的核设施、核活动始终保持安全稳定状态，特别是核电安全水平不断提高。

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To obtain a constant gradient magnetic field outside unilateral nuclear magnetic resonance (NMR), optimal design method based on finite element method (FEM) and topology optimization is proposed.

为了在单边核磁共振仪器外产生梯度恒定的磁场，提出利用基于拓扑优化和有限元法的优化设计方法。

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Its record on running civilian nuclear power projects is one of constant delays and huge cost overruns.

ECONOMIST: Selling Westinghouse is lucrative but controversial

Not everyone is convinced that wind-power is the most reliant route to clean, renewable carbon-free energy, and it is concerning that Britain is relying on a power source that must be backed up by more constant technologies such as nuclear, coal, or gas, because the wind blows inconsistently, as is its nature.

FORBES: Wind Power Efforts May Not Be Enough For U.K.

While the ship will not travel at warp speed, with an ion propulsion engine powered by a 1.5GW nuclear reactor, it can travel at a constant acceleration so that the ship can easily get to key points of interest in our solar system.

MSN: Spaceship Enterprise in 20 years? Beam me up!