核大国的英文：
a nuclear power (country)

nuclear ensemble
原子核系综

Is there a credible alternative to the nuclear deterrent?
是否有可以取代核威慑力量的可靠办法？

Government ceases nuclear testing.
政府停止了核试验。

smoothing power
修匀功效

These drugs are powerful.
这些药物很有效。

Applications of Power Electronics Technique in Power System
电力电子技术在电力系统中的应用

The country was in ferment.
那个国家处于动乱中。

It is the trademark of the country.
它是该国的标志。

This is an agricultural country.
这是个以农业为主的国家。